diff --git a/change/@boll-core-2020-10-22-10-57-00-dep-detector-improvement.json b/change/@boll-core-2020-10-22-10-57-00-dep-detector-improvement.json
new file mode 100644
index 00000000..95c29c99
--- /dev/null
+++ b/change/@boll-core-2020-10-22-10-57-00-dep-detector-improvement.json
@@ -0,0 +1,8 @@
+{
+  "type": "minor",
+  "comment": "in-config options for rules",
+  "packageName": "@boll/core",
+  "email": "jdh@microsoft.com",
+  "dependentChangeType": "patch",
+  "date": "2020-10-22T17:56:43.845Z"
+}
diff --git a/change/@boll-rules-core-2020-10-22-10-57-00-dep-detector-improvement.json b/change/@boll-rules-core-2020-10-22-10-57-00-dep-detector-improvement.json
new file mode 100644
index 00000000..c5200a11
--- /dev/null
+++ b/change/@boll-rules-core-2020-10-22-10-57-00-dep-detector-improvement.json
@@ -0,0 +1,8 @@
+{
+  "type": "patch",
+  "comment": "TransitiveDependencyDetector option to allow devDependencies",
+  "packageName": "@boll/rules-core",
+  "email": "jdh@microsoft.com",
+  "dependentChangeType": "patch",
+  "date": "2020-10-22T17:56:54.928Z"
+}
diff --git a/change/@boll-rules-external-tools-2020-10-22-10-57-00-dep-detector-improvement.json b/change/@boll-rules-external-tools-2020-10-22-10-57-00-dep-detector-improvement.json
new file mode 100644
index 00000000..d23b2f4c
--- /dev/null
+++ b/change/@boll-rules-external-tools-2020-10-22-10-57-00-dep-detector-improvement.json
@@ -0,0 +1,8 @@
+{
+  "type": "minor",
+  "comment": "TransitiveDependencyDetector option to allow devDependencies",
+  "packageName": "@boll/rules-external-tools",
+  "email": "jdh@microsoft.com",
+  "dependentChangeType": "patch",
+  "date": "2020-10-22T17:57:00.021Z"
+}
diff --git a/packages/core/src/config.ts b/packages/core/src/config.ts
index 1d099838..04692151 100644
--- a/packages/core/src/config.ts
+++ b/packages/core/src/config.ts
@@ -23,7 +23,9 @@ export class Config {
       const glob = ruleSetConfig.fileLocator;
       glob.exclude = exclude;
       glob.include = ruleSetConfig.include || [];
-      const checks = (ruleSetConfig.checks || []).map(check => this.ruleRegistry.get(check.rule)(this.logger));
+      const checks = (ruleSetConfig.checks || []).map(check =>
+        this.ruleRegistry.get(check.rule)(this.logger, check.options)
+      );
       return new RuleSet(glob, checks);
     });
   }
diff --git a/packages/core/src/rule-registry.ts b/packages/core/src/rule-registry.ts
index e64a6598..b7ee7b48 100644
--- a/packages/core/src/rule-registry.ts
+++ b/packages/core/src/rule-registry.ts
@@ -1,7 +1,8 @@
 import { Logger } from "./logger";
 import { PackageRule } from "./types";
 
-export type RuleDefinition = (logger: Logger) => PackageRule;
+export type RuleDefinition = (logger: Logger, options?: {}) => PackageRule;
+
 export class RuleRegistry {
   public registrations: { [name: string]: RuleDefinition } = {};
 
diff --git a/packages/core/src/tests/config.test.ts b/packages/core/src/tests/config.test.ts
index ecd1bd6e..fa054fa5 100644
--- a/packages/core/src/tests/config.test.ts
+++ b/packages/core/src/tests/config.test.ts
@@ -52,3 +52,19 @@ test("should apply exclude/include across extended config", () => {
   const suite = config.buildSuite();
   assert.deepStrictEqual(suite.ruleSets[0].fileGlob.exclude, ["testme"]);
 });
+
+test("gives options to factory function", () => {
+  const configRegistry = new ConfigRegistry();
+  const ruleRegistry = new RuleRegistry();
+  let calledWithCorrectArgs = false;
+  ruleRegistry.register("foo", (l: any, options: any) => {
+    if (options && options.bar === "baz") {
+      calledWithCorrectArgs = true;
+    }
+    return new FakeRule();
+  });
+  const config = new Config(configRegistry, ruleRegistry, NullLogger);
+  config.load({ ruleSets: [{ fileLocator: new FakeGlob(), checks: [{ rule: "foo", options: { bar: "baz" } }] }] });
+  config.buildSuite();
+  assert.ok(calledWithCorrectArgs, "Rule factory should have been invoked with correct args when creating suite.");
+});
diff --git a/packages/core/src/tests/pragma.test.ts b/packages/core/src/tests/pragma.test.ts
index 3dda99d5..8312ca89 100644
--- a/packages/core/src/tests/pragma.test.ts
+++ b/packages/core/src/tests/pragma.test.ts
@@ -7,14 +7,14 @@ export const test: any = baretest("Source detector");
 
 test("should keep track of a disabled rule in a FileContext", async () => {
   await inFixtureDir("standalone-source-files", __dirname, async cwd => {
-    const sut = await getSourceFile(cwd, "simple-disable.ts", new Package({},{}));
+    const sut = await getSourceFile(cwd, "simple-disable.ts", new Package({}, {}));
     assert.deepStrictEqual(sut.ignoredChecks, ["MadeUpCheckName"]);
   });
 });
 
 test("should keep track of multiple disabled rules in a FileContext", async () => {
   await inFixtureDir("standalone-source-files", __dirname, async cwd => {
-    const sut = await getSourceFile(cwd, "multiple-disable.ts", new Package({},{}));
+    const sut = await getSourceFile(cwd, "multiple-disable.ts", new Package({}, {}));
     assert.deepStrictEqual(sut.ignoredChecks, ["MadeUpCheckName", "AlsoMadeUpName"]);
   });
 });
diff --git a/packages/rules-external-tools/src/tests/eslint-prefer-const-rule.test.ts b/packages/rules-external-tools/src/tests/eslint-prefer-const-rule.test.ts
index d3ea59f6..3380f48d 100644
--- a/packages/rules-external-tools/src/tests/eslint-prefer-const-rule.test.ts
+++ b/packages/rules-external-tools/src/tests/eslint-prefer-const-rule.test.ts
@@ -18,7 +18,9 @@ test("Should succeed because prefer-const rule is set to 'error'", async () => {
 test("Should fail because prefer-const rule is set to 'off'", async () => {
   await inFixtureDir("configs/eslint/prefer-const/prefer-const-off", __dirname, async () => {
     const sut = new ESLintPreferConstRule(NullLogger);
-    const results = await sut.check(await getSourceFile(asBollDirectory("."), "prefer-const-off.ts", new Package({}, {})));
+    const results = await sut.check(
+      await getSourceFile(asBollDirectory("."), "prefer-const-off.ts", new Package({}, {}))
+    );
     assert.strictEqual(results.length, 1);
     assert.strictEqual(results[0].status, ResultStatus.failure);
     assert.strictEqual(