diff --git a/.gitignore b/.gitignore
index e8f3fe7e9..4f858bc49 100644
--- a/.gitignore
+++ b/.gitignore
@@ -173,7 +173,7 @@ common/temp/**
 package-deps.json
 
 # Default TypeSpec output
-typespec-output/
+tsp-output/
 
 # Visual Studio / C#
 bin/
diff --git a/README.md b/README.md
index b7bcd3b42..8968580e6 100644
--- a/README.md
+++ b/README.md
@@ -79,7 +79,7 @@ If you do not wish to install the compiler globally with `-g` flag, you will nee
    tsp compile .
    ```
 
-   This will compile the TypeSpec files in the project folder into one output file: `.\typespec-output\openapi.json`.
+   This will compile the TypeSpec files in the project folder into one output file: `.\tsp-output\openapi.json`.
 
 ## Troubleshooting
 
@@ -119,7 +119,7 @@ You can compile it to OpenAPI 3.0 by using the following command:
 tsp compile sample.tsp --emit @typespec/openapi3
 ```
 
-Once it compiles, you can find the emitted OpenAPI document in `./typespec-output/openapi.json.
+Once it compiles, you can find the emitted OpenAPI document in `./tsp-output/openapi.json.
 
 You can also pass in a directory instead of a file to `tsp compile`. That's
 equivalent to passing `main.tsp` in that directory.
diff --git a/common/changes/@typespec/compiler/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/compiler/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..3f4c4ed06
--- /dev/null
+++ b/common/changes/@typespec/compiler/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/compiler",
+      "comment": "Updating default output to tsp-output and package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/compiler"
+}
\ No newline at end of file
diff --git a/common/changes/@typespec/html-program-viewer/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/html-program-viewer/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..ec721fb9b
--- /dev/null
+++ b/common/changes/@typespec/html-program-viewer/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/html-program-viewer",
+      "comment": "Update package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/html-program-viewer"
+}
diff --git a/common/changes/@typespec/library-linter/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/library-linter/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..82a70f3e5
--- /dev/null
+++ b/common/changes/@typespec/library-linter/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/library-linter",
+      "comment": "Update package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/library-linter"
+}
\ No newline at end of file
diff --git a/common/changes/@typespec/lint/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/lint/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..732f2add2
--- /dev/null
+++ b/common/changes/@typespec/lint/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/lint",
+      "comment": "Update package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/lint"
+}
\ No newline at end of file
diff --git a/common/changes/@typespec/openapi/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/openapi/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..4b5b349e2
--- /dev/null
+++ b/common/changes/@typespec/openapi/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/openapi",
+      "comment": "Update package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/openapi"
+}
\ No newline at end of file
diff --git a/common/changes/@typespec/openapi3/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/openapi3/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..4e5eede75
--- /dev/null
+++ b/common/changes/@typespec/openapi3/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/openapi3",
+      "comment": "Update package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/openapi3"
+}
\ No newline at end of file
diff --git a/common/changes/@typespec/rest/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/rest/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..0d6249bbe
--- /dev/null
+++ b/common/changes/@typespec/rest/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/rest",
+      "comment": "Update package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/rest"
+}
\ No newline at end of file
diff --git a/common/changes/@typespec/versioning/tspOutput-tspMain_2023-02-18-08-56.json b/common/changes/@typespec/versioning/tspOutput-tspMain_2023-02-18-08-56.json
new file mode 100644
index 000000000..b55965373
--- /dev/null
+++ b/common/changes/@typespec/versioning/tspOutput-tspMain_2023-02-18-08-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/versioning",
+      "comment": "Update package.json entrypoint to tspMain",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/versioning"
+}
\ No newline at end of file
diff --git a/docs/extending-typespec/basics.md b/docs/extending-typespec/basics.md
index 4dfa2543e..568d6405c 100644
--- a/docs/extending-typespec/basics.md
+++ b/docs/extending-typespec/basics.md
@@ -59,7 +59,7 @@ Your package.json needs to refer to two main files: your node module main file,
 
 ```json
   "main": "dist/index.js",
-  "typespecMain": "lib/main.tsp"
+  "tspMain": "lib/main.tsp"
 ```
 
 ### 3. Install and initialize TypeScript
diff --git a/docs/extending-typespec/emitters-basics.md b/docs/extending-typespec/emitters-basics.md
index 482c9753e..b0e9575fc 100644
--- a/docs/extending-typespec/emitters-basics.md
+++ b/docs/extending-typespec/emitters-basics.md
@@ -185,4 +185,4 @@ Since an emitter is a node library, you could use standard `fs` APIs to write fi
 
 Instead, use the compiler [`host` interface](#todo) to access the file system. The API is equivalent to the node API but works in a wider range of scenarios.
 
-In order to know where to emit files, the emitter context has a `emitterOutputDir` property that is automatically resolved using the `emitter-output-dir` built-in emitter options. This is set to `{cwd}/typespec-output/{emitter-name}` by default, but can be overridden by the user. Do not use the `compilerOptions.outputDir`
+In order to know where to emit files, the emitter context has a `emitterOutputDir` property that is automatically resolved using the `emitter-output-dir` built-in emitter options. This is set to `{cwd}/tsp-output/{emitter-name}` by default, but can be overridden by the user. Do not use the `compilerOptions.outputDir`
diff --git a/docs/language-basics/imports.md b/docs/language-basics/imports.md
index b420f9e51..211891673 100644
--- a/docs/language-basics/imports.md
+++ b/docs/language-basics/imports.md
@@ -23,7 +23,7 @@ import "./decorators.js";
 
 ## Import a library
 
-The import value can be name one of the package dependencies. In that case typespec will lookup for the `package.json` file and check the `typespecMain` entry (or default to `main` if absent) to decide what is the library entrypoint to load.
+The import value can be name one of the package dependencies. In that case typespec will lookup for the `package.json` file and check the `tspMain` entry (or default to `main` if absent) to decide what is the library entrypoint to load.
 
 ```typespec
 import "@typespec/rest";
@@ -32,7 +32,7 @@ import "@typespec/rest";
 ```json
 // ./node_modules/@typespec/rest/package.json
 {
-  "typespecMain": "./lib/main.tsp"
+  "tspMain": "./lib/main.tsp"
 }
 ```
 
@@ -47,5 +47,5 @@ import "./models"; // same as `import "./models/main.tsp";
 ```
 
 ```typespec
-import "./path/to/local/module"; // Assuming this path is a typespec package, it will load it using the typespecMain file.
+import "./path/to/local/module"; // Assuming this path is a typespec package, it will load it using the tspMain file.
 ```
diff --git a/e2e/e2e-tests.js b/e2e/e2e-tests.js
index 59c97e53c..b52b9be0f 100644
--- a/e2e/e2e-tests.js
+++ b/e2e/e2e-tests.js
@@ -63,7 +63,7 @@ function runTypeSpec(compilerTgz, args, options) {
 
 function testBasicLatest(packages) {
   const basicLatestDir = join(e2eTestDir, "basic-latest");
-  const outputDir = join(basicLatestDir, "typespec-output");
+  const outputDir = join(basicLatestDir, "tsp-output");
   console.log("Clearing basic-latest output");
   rmSync(outputDir, { recursive: true, force: true });
   console.log("Cleared basic-latest output");
@@ -87,7 +87,7 @@ function testBasicLatest(packages) {
 
 function testBasicCurrentTgz(packages) {
   const basicCurrentDir = join(e2eTestDir, "basic-current");
-  const outputDir = join(basicCurrentDir, "typespec-output");
+  const outputDir = join(basicCurrentDir, "tsp-output");
   console.log("Clearing basic-current");
   rmSync(outputDir, { recursive: true, force: true });
   console.log("Cleared basic-current");
diff --git a/packages/bundler/package.json b/packages/bundler/package.json
index 49a8d8859..c19bb1230 100644
--- a/packages/bundler/package.json
+++ b/packages/bundler/package.json
@@ -18,7 +18,7 @@
   ],
   "type": "module",
   "main": "dist/src/index.js",
-  "typespecMain": "dist/src/index.js",
+  "tspMain": "dist/src/index.js",
   "engines": {
     "node": ">=16.0.0"
   },
diff --git a/packages/bundler/src/bundler.ts b/packages/bundler/src/bundler.ts
index 5cbe9399b..4cecdd6ba 100644
--- a/packages/bundler/src/bundler.ts
+++ b/packages/bundler/src/bundler.ts
@@ -42,7 +42,7 @@ export interface TypeSpecBundleFile {
 interface PackageJson {
   name: string;
   main: string;
-  typespecMain?: string;
+  tspMain?: string;
   peerDependencies: string[];
   dependencies: string[];
   exports?: Record<string, string>;
diff --git a/packages/compiler/config/config-loader.ts b/packages/compiler/config/config-loader.ts
index f33666b24..406bccdb8 100644
--- a/packages/compiler/config/config-loader.ts
+++ b/packages/compiler/config/config-loader.ts
@@ -10,7 +10,7 @@ import { TypeSpecConfig, TypeSpecRawConfig } from "./types.js";
 export const TypeSpecConfigFilename = "tspconfig.yaml";
 
 export const defaultConfig = deepFreeze({
-  outputDir: "{cwd}/typespec-output",
+  outputDir: "{cwd}/tsp-output",
   diagnostics: [] as Diagnostic[],
 });
 
@@ -147,7 +147,7 @@ async function loadConfigFile(
     extends: data.extends,
     environmentVariables: data["environment-variables"],
     parameters: data.parameters,
-    outputDir: data["output-dir"] ?? "{cwd}/typespec-output",
+    outputDir: data["output-dir"] ?? "{cwd}/tsp-output",
     warnAsError: data["warn-as-error"],
     imports: data.imports,
     trace: typeof data.trace === "string" ? [data.trace] : data.trace,
diff --git a/packages/compiler/core/messages.ts b/packages/compiler/core/messages.ts
index 4030f6c14..9e727f18b 100644
--- a/packages/compiler/core/messages.ts
+++ b/packages/compiler/core/messages.ts
@@ -528,7 +528,7 @@ const diagnostics = {
   "library-invalid": {
     severity: "error",
     messages: {
-      typespecMain: paramMessage`Library "${"path"}" has an invalid typespecMain file.`,
+      tspMain: paramMessage`Library "${"path"}" has an invalid tspMain file.`,
       default: paramMessage`Library "${"path"}" has an invalid main file.`,
     },
   },
diff --git a/packages/compiler/core/module-resolver.ts b/packages/compiler/core/module-resolver.ts
index 4f963f4e6..45dbe304d 100644
--- a/packages/compiler/core/module-resolver.ts
+++ b/packages/compiler/core/module-resolver.ts
@@ -41,7 +41,7 @@ export interface NodePackage {
   type?: "module" | "commonjs";
   main?: string;
   version: string;
-  typespecMain?: string;
+  tspMain?: string;
   homepage?: string;
   bugs?: {
     url?: string;
diff --git a/packages/compiler/core/options.ts b/packages/compiler/core/options.ts
index 0472b237f..a61220329 100644
--- a/packages/compiler/core/options.ts
+++ b/packages/compiler/core/options.ts
@@ -6,7 +6,7 @@ export interface CompilerOptions {
   /**
    * Default output directory used by emitters.
    *
-   * @default ./typespec-output
+   * @default ./tsp-output
    */
   outputDir?: string;
 
diff --git a/packages/compiler/core/program.ts b/packages/compiler/core/program.ts
index d54435e5d..f805e5874 100644
--- a/packages/compiler/core/program.ts
+++ b/packages/compiler/core/program.ts
@@ -799,8 +799,8 @@ export async function compile(
         directoryIndexFiles: ["main.tsp", "index.mjs", "index.js"],
         resolveMain(pkg) {
           // this lets us follow node resolve semantics more-or-less exactly
-          // but using typespecMain instead of main.
-          return pkg.typespecMain ?? pkg.main;
+          // but using tspMain instead of main.
+          return pkg.tspMain ?? pkg.main;
         },
       });
     } catch (e: any) {
@@ -814,7 +814,7 @@ export async function compile(
           createDiagnostic({
             code: "library-invalid",
             format: { path: specifier },
-            messageId: "typespecMain",
+            messageId: "tspMain",
             target,
           })
         );
@@ -899,10 +899,7 @@ export async function compile(
     const [pkg] = await loadFile(host, pkgJsonPath, JSON.parse, program.reportDiagnostic, {
       allowFileNotFound: true,
     });
-    const mainFile = resolvePath(
-      dir,
-      typeof pkg?.typespecMain === "string" ? pkg.typespecMain : "main.tsp"
-    );
+    const mainFile = resolvePath(dir, typeof pkg?.tspMain === "string" ? pkg.tspMain : "main.tsp");
     return mainFile;
   }
 
diff --git a/packages/compiler/package.json b/packages/compiler/package.json
index cc3667274..e32da2643 100644
--- a/packages/compiler/package.json
+++ b/packages/compiler/package.json
@@ -19,7 +19,7 @@
   ],
   "type": "module",
   "main": "dist/core/index.js",
-  "typespecMain": "lib/main.tsp",
+  "tspMain": "lib/main.tsp",
   "exports": {
     ".": "./dist/core/index.js",
     "./testing": "./dist/testing/index.js",
diff --git a/packages/compiler/server/completion.ts b/packages/compiler/server/completion.ts
index 980d32e43..10c6e009b 100644
--- a/packages/compiler/server/completion.ts
+++ b/packages/compiler/server/completion.ts
@@ -140,7 +140,7 @@ async function addLibraryImportCompletion(
         JSON.parse,
         program.reportDiagnostic
       );
-      if (libPackageJson.typespecMain !== undefined) {
+      if (libPackageJson.tspMain !== undefined) {
         const range = {
           start: file.file.getLineAndCharacterOfPosition(node.pos + 1),
           end: file.file.getLineAndCharacterOfPosition(node.end - 1),
diff --git a/packages/compiler/server/serverlib.ts b/packages/compiler/server/serverlib.ts
index e92e7a37d..3d192d156 100644
--- a/packages/compiler/server/serverlib.ts
+++ b/packages/compiler/server/serverlib.ts
@@ -1100,7 +1100,7 @@ export function createServer(host: ServerHost): Server {
    * results can be obtained from compiling the same file with different entry
    * points.
    *
-   * Walk directory structure upwards looking for package.json with typespecMain or
+   * Walk directory structure upwards looking for package.json with tspMain or
    * main.tsp file. Stop search when reaching a workspace root. If a root is
    * reached without finding an entry point, use the given path as its own
    * entry point.
@@ -1136,8 +1136,8 @@ export function createServer(host: ServerHost): Server {
         await fileSystemCache.setData(pkgPath, pkg ?? {});
       }
 
-      if (typeof pkg?.typespecMain === "string") {
-        mainFile = pkg.typespecMain;
+      if (typeof pkg?.tspMain === "string") {
+        mainFile = pkg.tspMain;
       }
 
       const candidate = joinPaths(dir, mainFile);
diff --git a/packages/compiler/test/checker/imports.test.ts b/packages/compiler/test/checker/imports.test.ts
index 0abe7e3ab..0481a9c73 100644
--- a/packages/compiler/test/checker/imports.test.ts
+++ b/packages/compiler/test/checker/imports.test.ts
@@ -117,7 +117,7 @@ describe("compiler: imports", () => {
     host.addTypeSpecFile(
       "node_modules/my-lib/package.json",
       JSON.stringify({
-        typespecMain: "./main.tsp",
+        tspMain: "./main.tsp",
       })
     );
     host.addTypeSpecFile(
diff --git a/packages/compiler/test/cli.test.ts b/packages/compiler/test/cli.test.ts
index f366393f7..8288b0b8e 100644
--- a/packages/compiler/test/cli.test.ts
+++ b/packages/compiler/test/cli.test.ts
@@ -26,10 +26,10 @@ describe("compiler: cli", () => {
       return options;
     }
 
-    it("no args and config: return empty options with output-dir at {cwd}/typespec-output", async () => {
+    it("no args and config: return empty options with output-dir at {cwd}/tsp-output", async () => {
       const options = await resolveCompilerOptions({});
       deepStrictEqual(options, {
-        outputDir: `${cwd}/typespec-output`,
+        outputDir: `${cwd}/tsp-output`,
         options: {},
       });
     });
@@ -71,7 +71,7 @@ describe("compiler: cli", () => {
 
         strictEqual(
           options?.options?.["@typespec/openapi3"]?.["emitter-output-dir"],
-          `${cwd}/typespec-output/custom`
+          `${cwd}/tsp-output/custom`
         );
       });
 
diff --git a/packages/compiler/test/config/config.test.ts b/packages/compiler/test/config/config.test.ts
index eaecf032f..7110cab4a 100644
--- a/packages/compiler/test/config/config.test.ts
+++ b/packages/compiler/test/config/config.test.ts
@@ -25,7 +25,7 @@ describe("compiler: config file loading", () => {
       const config = await loadTestConfig("simple");
       deepStrictEqual(config, {
         diagnostics: [],
-        outputDir: "{cwd}/typespec-output",
+        outputDir: "{cwd}/tsp-output",
         emit: ["openapi"],
       });
     });
@@ -35,7 +35,7 @@ describe("compiler: config file loading", () => {
       deepStrictEqual(config, {
         diagnostics: [],
         extends: "./typespec-base.yaml",
-        outputDir: "{cwd}/typespec-output",
+        outputDir: "{cwd}/tsp-output",
         emit: ["openapi"],
       });
     });
@@ -44,7 +44,7 @@ describe("compiler: config file loading", () => {
       const config = await loadTestConfig("empty");
       deepStrictEqual(config, {
         diagnostics: [],
-        outputDir: "{cwd}/typespec-output",
+        outputDir: "{cwd}/tsp-output",
       });
     });
 
@@ -53,7 +53,7 @@ describe("compiler: config file loading", () => {
       config = await loadTestConfig("empty");
       deepStrictEqual(config, {
         diagnostics: [],
-        outputDir: "{cwd}/typespec-output",
+        outputDir: "{cwd}/tsp-output",
       });
     });
 
@@ -63,7 +63,7 @@ describe("compiler: config file loading", () => {
       config = await loadTestConfig("simple");
       deepStrictEqual(config, {
         diagnostics: [],
-        outputDir: "{cwd}/typespec-output",
+        outputDir: "{cwd}/tsp-output",
         emit: ["openapi"],
       });
     });
diff --git a/packages/compiler/test/e2e/scenarios/emitter-require-import/node_modules/@typespec/my-lib/package.json b/packages/compiler/test/e2e/scenarios/emitter-require-import/node_modules/@typespec/my-lib/package.json
index a5a72fe0f..a6690a3f1 100644
--- a/packages/compiler/test/e2e/scenarios/emitter-require-import/node_modules/@typespec/my-lib/package.json
+++ b/packages/compiler/test/e2e/scenarios/emitter-require-import/node_modules/@typespec/my-lib/package.json
@@ -1,5 +1,5 @@
 {
   "name": "@typespec/my-lib",
   "type": "module",
-  "typespecMain": "main.tsp"
+  "tspMain": "main.tsp"
 }
diff --git a/packages/compiler/test/e2e/scenarios/emitter-with-typespec/package.json b/packages/compiler/test/e2e/scenarios/emitter-with-typespec/package.json
index 414642b82..b72fdbbd4 100644
--- a/packages/compiler/test/e2e/scenarios/emitter-with-typespec/package.json
+++ b/packages/compiler/test/e2e/scenarios/emitter-with-typespec/package.json
@@ -2,5 +2,5 @@
   "name": "@typespec/test-emitter-with-typespec",
   "type": "module",
   "main": "lib.js",
-  "typespecMain": "lib.tsp"
+  "tspMain": "lib.tsp"
 }
diff --git a/packages/compiler/test/e2e/scenarios/import-library-invalid/node_modules/my-lib/package.json b/packages/compiler/test/e2e/scenarios/import-library-invalid/node_modules/my-lib/package.json
index 1defa6a4b..4e9fbb136 100644
--- a/packages/compiler/test/e2e/scenarios/import-library-invalid/node_modules/my-lib/package.json
+++ b/packages/compiler/test/e2e/scenarios/import-library-invalid/node_modules/my-lib/package.json
@@ -2,5 +2,5 @@
   "name": "@typespec/my-lib",
   "type": "module",
   "main": "not-a-file.js",
-  "typespecMain": "not-a-file.tsp"
+  "tspMain": "not-a-file.tsp"
 }
diff --git a/packages/compiler/test/e2e/scenarios/invalid-lib/package.json b/packages/compiler/test/e2e/scenarios/invalid-lib/package.json
index e0f1b76ec..b8c62df33 100644
--- a/packages/compiler/test/e2e/scenarios/invalid-lib/package.json
+++ b/packages/compiler/test/e2e/scenarios/invalid-lib/package.json
@@ -2,5 +2,5 @@
   "name": "@typespec/test-typespec-lib",
   "type": "module",
   "main": "lib.txt",
-  "typespecMain": "lib.txt"
+  "tspMain": "lib.txt"
 }
diff --git a/packages/compiler/test/e2e/scenarios/js-lib/package.json b/packages/compiler/test/e2e/scenarios/js-lib/package.json
index 5feda306b..7621d5a44 100644
--- a/packages/compiler/test/e2e/scenarios/js-lib/package.json
+++ b/packages/compiler/test/e2e/scenarios/js-lib/package.json
@@ -2,5 +2,5 @@
   "name": "@typespec/test-js-lib",
   "type": "module",
   "main": "lib.js",
-  "typespecMain": "lib.js"
+  "tspMain": "lib.js"
 }
diff --git a/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib1/package.json b/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib1/package.json
index 3f41a1a32..1f7d226f7 100644
--- a/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib1/package.json
+++ b/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib1/package.json
@@ -3,5 +3,5 @@
   "type": "module",
   "version": "1.0.0",
   "main": "emitter.js",
-  "typespecMain": "main.tsp"
+  "tspMain": "main.tsp"
 }
diff --git a/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib2/package.json b/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib2/package.json
index 4b5f62790..5fe529c4d 100644
--- a/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib2/package.json
+++ b/packages/compiler/test/e2e/scenarios/same-library-diff-version/node_modules/@typespec/lib2/package.json
@@ -3,5 +3,5 @@
   "type": "module",
   "version": "2.0.0",
   "main": "emitter.js",
-  "typespecMain": "main.tsp"
+  "tspMain": "main.tsp"
 }
diff --git a/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib1/package.json b/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib1/package.json
index 3f41a1a32..1f7d226f7 100644
--- a/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib1/package.json
+++ b/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib1/package.json
@@ -3,5 +3,5 @@
   "type": "module",
   "version": "1.0.0",
   "main": "emitter.js",
-  "typespecMain": "main.tsp"
+  "tspMain": "main.tsp"
 }
diff --git a/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib2/package.json b/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib2/package.json
index 3f41a1a32..1f7d226f7 100644
--- a/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib2/package.json
+++ b/packages/compiler/test/e2e/scenarios/same-library-same-version/node_modules/@typespec/lib2/package.json
@@ -3,5 +3,5 @@
   "type": "module",
   "version": "1.0.0",
   "main": "emitter.js",
-  "typespecMain": "main.tsp"
+  "tspMain": "main.tsp"
 }
diff --git a/packages/compiler/test/e2e/scenarios/scenarios.e2e.ts b/packages/compiler/test/e2e/scenarios/scenarios.e2e.ts
index df7ad4a43..1b76c8511 100644
--- a/packages/compiler/test/e2e/scenarios/scenarios.e2e.ts
+++ b/packages/compiler/test/e2e/scenarios/scenarios.e2e.ts
@@ -47,7 +47,7 @@ describe("compiler: entrypoints", () => {
       });
       expectDiagnostics(program.diagnostics, {
         code: "library-invalid",
-        message: `Library "my-lib" has an invalid typespecMain file.`,
+        message: `Library "my-lib" has an invalid tspMain file.`,
       });
     });
 
diff --git a/packages/compiler/test/e2e/scenarios/typespec-lib/package.json b/packages/compiler/test/e2e/scenarios/typespec-lib/package.json
index 562a72290..479566f87 100644
--- a/packages/compiler/test/e2e/scenarios/typespec-lib/package.json
+++ b/packages/compiler/test/e2e/scenarios/typespec-lib/package.json
@@ -2,5 +2,5 @@
   "name": "@typespec/test-typespec-lib",
   "type": "module",
   "main": "lib.js",
-  "typespecMain": "lib.tsp"
+  "tspMain": "lib.tsp"
 }
diff --git a/packages/compiler/test/emitter-framework/emitter.test.ts b/packages/compiler/test/emitter-framework/emitter.test.ts
index 75e354a72..8ff87c2ac 100644
--- a/packages/compiler/test/emitter-framework/emitter.test.ts
+++ b/packages/compiler/test/emitter-framework/emitter.test.ts
@@ -88,7 +88,7 @@ class SingleFileEmitter extends TypeScriptInterfaceEmitter {
 async function emitTypeSpecToTs(code: string) {
   const emitter = await emitTypeSpec(SingleFileEmitter, code, {}, false);
 
-  const sf = await emitter.getProgram().host.readFile("./typespec-output/output.ts");
+  const sf = await emitter.getProgram().host.readFile("./tsp-output/output.ts");
   return sf.text;
 }
 
@@ -265,9 +265,9 @@ describe("typescript emitter", () => {
     emitter.emitProgram();
     await emitter.writeOutput();
 
-    const files = await host.program.host.readDir("./typespec-output");
+    const files = await host.program.host.readDir("./tsp-output");
     assert.strictEqual(files.length, 1);
-    const contents = (await host.program.host.readFile("./typespec-output/output.ts")).text;
+    const contents = (await host.program.host.readFile("./tsp-output/output.ts")).text;
     // some light assertions
     assert.match(contents, /export interface Basic/);
     assert.match(contents, /export interface HasRef/);
@@ -325,7 +325,7 @@ describe("typescript emitter", () => {
 
     await emitter.writeOutput();
 
-    const files = new Set(await host.program.host.readDir("./typespec-output"));
+    const files = new Set(await host.program.host.readDir("./tsp-output"));
     [
       "Basic.ts",
       "RefsOtherModel.ts",
@@ -406,7 +406,7 @@ describe("typescript emitter", () => {
     } as any);
     emitter.emitProgram();
     await emitter.writeOutput();
-    const contents = (await host.compilerHost.readFile("typespec-output/output.ts")).text;
+    const contents = (await host.compilerHost.readFile("tsp-output/output.ts")).text;
     assert.match(contents, /namespace B/);
     assert.match(contents, /namespace R/);
     assert.match(contents, /namespace H/);
@@ -434,7 +434,7 @@ describe("typescript emitter", () => {
     } as any);
     emitter.emitProgram();
     await emitter.writeOutput();
-    const contents = (await host.compilerHost.readFile("typespec-output/output.ts")).text;
+    const contents = (await host.compilerHost.readFile("tsp-output/output.ts")).text;
     assert.match(contents, /prop: Foo/);
     assert.match(contents, /prop: Baz/);
   });
@@ -676,9 +676,7 @@ describe("Object emitter", () => {
     } as any);
     assetEmitter.emitProgram();
     await assetEmitter.writeOutput();
-    const contents = JSON.parse(
-      (await host.compilerHost.readFile("typespec-output/test.json")!).text
-    );
+    const contents = JSON.parse((await host.compilerHost.readFile("tsp-output/test.json")!).text);
     assert.strictEqual(contents.declarations.length, 2);
   });
 });
diff --git a/packages/compiler/test/emitter-framework/host.ts b/packages/compiler/test/emitter-framework/host.ts
index 76b86493e..22691a988 100644
--- a/packages/compiler/test/emitter-framework/host.ts
+++ b/packages/compiler/test/emitter-framework/host.ts
@@ -31,7 +31,7 @@ export async function getHostForTypeSpecFile(contents: string, decorators?: Reco
   }
   await host.addTypeSpecFile("main.tsp", contents);
   await host.compile("main.tsp", {
-    outputDir: "typespec-output",
+    outputDir: "tsp-output",
   });
   return host;
 }
@@ -44,7 +44,7 @@ export async function emitTypeSpec(
 ) {
   const host = await getHostForTypeSpecFile(code);
   const emitter = createAssetEmitter(host.program, Emitter, {
-    emitterOutputDir: "typespec-output",
+    emitterOutputDir: "tsp-output",
     options: {},
   } as any);
   const spies = emitterSpies(Emitter);
diff --git a/packages/compiler/test/libraries/library-dev/package.json b/packages/compiler/test/libraries/library-dev/package.json
index ec1889b53..317963dff 100644
--- a/packages/compiler/test/libraries/library-dev/package.json
+++ b/packages/compiler/test/libraries/library-dev/package.json
@@ -1,5 +1,5 @@
 {
   "name": "my-typespec-library",
   "type": "module",
-  "typespecMain": "./src/main.tsp"
+  "tspMain": "./src/main.tsp"
 }
diff --git a/packages/compiler/test/libraries/simple/node_modules/CustomTypeSpecMain/package.json b/packages/compiler/test/libraries/simple/node_modules/CustomTypeSpecMain/package.json
index b0c470529..9029ee674 100644
--- a/packages/compiler/test/libraries/simple/node_modules/CustomTypeSpecMain/package.json
+++ b/packages/compiler/test/libraries/simple/node_modules/CustomTypeSpecMain/package.json
@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "",
   "main": "index.js",
-  "typespecMain": "index.tsp",
+  "tspMain": "index.tsp",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
diff --git a/packages/compiler/test/libraries/simple/node_modules/MyLib/package.json b/packages/compiler/test/libraries/simple/node_modules/MyLib/package.json
index b49bd3d5a..b07fcc1bf 100644
--- a/packages/compiler/test/libraries/simple/node_modules/MyLib/package.json
+++ b/packages/compiler/test/libraries/simple/node_modules/MyLib/package.json
@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "",
   "main": "index.js",
-  "typespecMain": "main.tsp",
+  "tspMain": "main.tsp",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
diff --git a/packages/compiler/test/server/completion.test.ts b/packages/compiler/test/server/completion.test.ts
index fe7cbc329..17075d42a 100644
--- a/packages/compiler/test/server/completion.test.ts
+++ b/packages/compiler/test/server/completion.test.ts
@@ -56,11 +56,11 @@ describe("compiler: server: completion", () => {
           },
         }),
         "test/node_modules/@typespec/library1/package.json": JSON.stringify({
-          typespecMain: "./foo.js",
+          tspMain: "./foo.js",
         }),
         "test/node_modules/non-typespec-library/package.json": JSON.stringify({}),
         "test/node_modules/@typespec/library2/package.json": JSON.stringify({
-          typespecMain: "./foo.js",
+          tspMain: "./foo.js",
         }),
       });
 
diff --git a/packages/compiler/tsconfig.json b/packages/compiler/tsconfig.json
index ddbfbae06..21c10ced3 100644
--- a/packages/compiler/tsconfig.json
+++ b/packages/compiler/tsconfig.json
@@ -7,5 +7,5 @@
     "types": ["node", "mocha"]
   },
   "include": ["./**/*.ts"],
-  "exclude": ["dist", "node_modules", "temp", "typespec-output"]
+  "exclude": ["dist", "node_modules", "temp", "tsp-output"]
 }
diff --git a/packages/html-program-viewer/package.json b/packages/html-program-viewer/package.json
index e78c923e0..8e7dd761f 100644
--- a/packages/html-program-viewer/package.json
+++ b/packages/html-program-viewer/package.json
@@ -32,7 +32,7 @@
       ]
     }
   },
-  "typespecMain": "dist/src/index.js",
+  "tspMain": "dist/src/index.js",
   "engines": {
     "node": ">=14.0.0"
   },
diff --git a/packages/library-linter/package.json b/packages/library-linter/package.json
index 1355dbe79..0ecf2e844 100644
--- a/packages/library-linter/package.json
+++ b/packages/library-linter/package.json
@@ -32,7 +32,7 @@
       ]
     }
   },
-  "typespecMain": "dist/src/index.js",
+  "tspMain": "dist/src/index.js",
   "engines": {
     "node": ">=14.0.0"
   },
diff --git a/packages/lint/package.json b/packages/lint/package.json
index 65540d51a..14cf9f0c7 100644
--- a/packages/lint/package.json
+++ b/packages/lint/package.json
@@ -18,7 +18,7 @@
   ],
   "type": "module",
   "main": "dist/src/index.js",
-  "typespecMain": "dist/src/index.js",
+  "tspMain": "dist/src/index.js",
   "exports": {
     ".": "./dist/src/index.js",
     "./testing": "./dist/src/testing/index.js"
diff --git a/packages/openapi/package.json b/packages/openapi/package.json
index bcf474f20..161edf149 100644
--- a/packages/openapi/package.json
+++ b/packages/openapi/package.json
@@ -18,7 +18,7 @@
   ],
   "type": "module",
   "main": "dist/src/index.js",
-  "typespecMain": "lib/main.tsp",
+  "tspMain": "lib/main.tsp",
   "exports": {
     ".": "./dist/src/index.js",
     "./testing": "./dist/src/testing/index.js"
diff --git a/packages/openapi3/package.json b/packages/openapi3/package.json
index 213b0f9f7..34af888c7 100644
--- a/packages/openapi3/package.json
+++ b/packages/openapi3/package.json
@@ -32,7 +32,7 @@
       ]
     }
   },
-  "typespecMain": "dist/src/index.js",
+  "tspMain": "dist/src/index.js",
   "engines": {
     "node": ">=16.0.0"
   },
diff --git a/packages/playground/src/components/output-view.tsx b/packages/playground/src/components/output-view.tsx
index 457a3c095..faf968799 100644
--- a/packages/playground/src/components/output-view.tsx
+++ b/packages/playground/src/components/output-view.tsx
@@ -46,7 +46,7 @@ const OutputViewInternal: FunctionComponent<{ compilationResult: CompileResult }
   }, [program, outputFiles]);
 
   async function loadOutputFile(path: string) {
-    const contents = await program.host.readFile("./typespec-output/" + path);
+    const contents = await program.host.readFile("./tsp-output/" + path);
     setViewSelection({ type: "file", filename: path, content: contents.text });
   }
 
diff --git a/packages/playground/src/components/playground.tsx b/packages/playground/src/components/playground.tsx
index 3e48eb527..67c4870dd 100644
--- a/packages/playground/src/components/playground.tsx
+++ b/packages/playground/src/components/playground.tsx
@@ -149,7 +149,7 @@ const PlaygroundInternal: FunctionComponent<PlaygroundProps> = ({
   );
 };
 
-const outputDir = "./typespec-output";
+const outputDir = "./tsp-output";
 
 async function compile(
   host: BrowserHost,
@@ -162,13 +162,13 @@ async function compile(
   try {
     const typespecCompiler = await importTypeSpecCompiler();
     const program = await typespecCompiler.compile(host, "main.tsp", {
-      outputDir: "typespec-output",
+      outputDir: "tsp-output",
       emit: [selectedEmitter],
       options: {
         ...emittersOptions,
         [selectedEmitter]: {
           ...emittersOptions[selectedEmitter],
-          "emitter-output-dir": "typespec-output",
+          "emitter-output-dir": "tsp-output",
         },
       },
     });
@@ -200,9 +200,9 @@ async function findOutputFiles(host: BrowserHost): Promise<string[]> {
 
 async function emptyOutputDir(host: BrowserHost) {
   // empty output directory
-  const dirs = await host.readDir("./typespec-output");
+  const dirs = await host.readDir("./tsp-output");
   for (const file of dirs) {
-    const path = "./typespec-output/" + file;
+    const path = "./tsp-output/" + file;
     const uri = Uri.parse(host.pathToFileURL(path));
     const model = editor.getModel(uri);
     if (model) {
diff --git a/packages/ref-doc/package.json b/packages/ref-doc/package.json
index b20725030..ba55c9944 100644
--- a/packages/ref-doc/package.json
+++ b/packages/ref-doc/package.json
@@ -28,7 +28,7 @@
       ]
     }
   },
-  "typespecMain": "dist/src/index.js",
+  "tspMain": "dist/src/index.js",
   "engines": {
     "node": ">=16.0.0"
   },
diff --git a/packages/ref-doc/src/experimental.ts b/packages/ref-doc/src/experimental.ts
index f265640b9..339ab1e32 100644
--- a/packages/ref-doc/src/experimental.ts
+++ b/packages/ref-doc/src/experimental.ts
@@ -13,8 +13,8 @@ export async function generateLibraryDocs(
   outputDir: string
 ) {
   const pkgJson = await readPackageJson(libraryPath);
-  if (pkgJson.typespecMain) {
-    const main = joinPaths(libraryPath, pkgJson.typespecMain);
+  if (pkgJson.tspMain) {
+    const main = joinPaths(libraryPath, pkgJson.tspMain);
     const program = await compile(NodeHost, main, {
       parseOptions: { comments: true, docs: true },
     });
diff --git a/packages/rest/package.json b/packages/rest/package.json
index 2fbeb61e6..8a1de2b84 100644
--- a/packages/rest/package.json
+++ b/packages/rest/package.json
@@ -18,7 +18,7 @@
   ],
   "type": "module",
   "main": "dist/src/index.js",
-  "typespecMain": "lib/rest.tsp",
+  "tspMain": "lib/rest.tsp",
   "exports": {
     ".": "./dist/src/index.js",
     "./http": "./dist/src/http/index.js",
diff --git a/packages/samples/petstore/package.json b/packages/samples/petstore/package.json
index d2fca46df..cf3e2df14 100644
--- a/packages/samples/petstore/package.json
+++ b/packages/samples/petstore/package.json
@@ -1,4 +1,4 @@
 {
-  "typespecMain": "petstore.tsp",
+  "tspMain": "petstore.tsp",
   "type": "module"
 }
diff --git a/packages/samples/rest/petstore/package.json b/packages/samples/rest/petstore/package.json
index d2fca46df..cf3e2df14 100644
--- a/packages/samples/rest/petstore/package.json
+++ b/packages/samples/rest/petstore/package.json
@@ -1,4 +1,4 @@
 {
-  "typespecMain": "petstore.tsp",
+  "tspMain": "petstore.tsp",
   "type": "module"
 }
diff --git a/packages/versioning/package.json b/packages/versioning/package.json
index 15b34e6bb..a4cb6bdd5 100644
--- a/packages/versioning/package.json
+++ b/packages/versioning/package.json
@@ -18,7 +18,7 @@
   ],
   "type": "module",
   "main": "dist/src/index.js",
-  "typespecMain": "lib/versioning.tsp",
+  "tspMain": "lib/versioning.tsp",
   "exports": {
     ".": "./dist/src/index.js",
     "./testing": "./dist/src/testing/index.js"