Add TSDocConfigFile.loadFromObject() needed for https://github.com/microsoft/rushstack/pull/1950

tsdoc-config/src/TSDocConfigFile.ts

@@ -94,7 +94,8 @@ export class TSDocConfigFile {
   }
 
   /**
-   * The full path of the file that was attempted to load.
+   * The full path of the file that was attempted to load, or an empty string if the configuration was
+   * loaded from a source that is not a file.
    */
   public get filePath(): string {
     return this._filePath;
@@ -276,13 +277,9 @@ export class TSDocConfigFile {
     this._hasErrors = true;
   }
 
-  private _loadJsonFile(): void {
+  private _loadJsonObject(configJson: IConfigJson): void {
-    const configJsonContent: string = fs.readFileSync(this._filePath).toString();
-    this._fileMTime = fs.statSync(this._filePath).mtimeMs;
     this._fileNotFound = false;
 
-    const configJson: IConfigJson = jju.parse(configJsonContent, { mode: 'cjson' });
-
     if (configJson.$schema !== TSDocConfigFile.CURRENT_SCHEMA_URL) {
       this._reportError({
         messageId: TSDocMessageId.ConfigFileUnsupportedSchema,
@@ -381,7 +378,12 @@ export class TSDocConfigFile {
     }
     alreadyVisitedPaths.add(hashKey);
 
-    this._loadJsonFile();
+    const configJsonContent: string = fs.readFileSync(this._filePath).toString();
+    this._fileMTime = fs.statSync(this._filePath).mtimeMs;
+
+    const configJson: IConfigJson = jju.parse(configJsonContent, { mode: 'cjson' });
+
+    this._loadJsonObject(configJson);
 
     const configFileFolder: string = path.dirname(this.filePath);
 
@@ -462,6 +464,24 @@ export class TSDocConfigFile {
     return configFile;
   }
 
+  /**
+   * Loads the object state from a JSON-serializable object as produced by {@link TSDocConfigFile.saveToObject}.
+   *
+   * @remarks
+   * The serialized object has the same structure as `tsdoc.json`; however the `"extends"` field is not allowed.
+   */
+  public static loadFromObject(jsonObject: unknown): TSDocConfigFile {
+    const configFile: TSDocConfigFile = new TSDocConfigFile();
+
+    configFile._loadJsonObject(jsonObject as IConfigJson);
+
+    if (configFile.extendsPaths.length > 0) {
+      throw new Error('The "extends" field cannot be used with TSDocConfigFile.loadFromObject()');
+    }
+
+    return configFile;
+  }
+
   /**
    * Initializes a TSDocConfigFile object using the state from the provided `TSDocConfiguration` object.
    */
@@ -563,7 +583,13 @@ export class TSDocConfigFile {
       return 'No errors.';
     }
 
-    let result: string = `Errors encountered for ${this.filePath}:\n`;
+    let result: string;
+
+    if (this.filePath) {
+      result = `Errors encountered for ${this.filePath}:\n`;
+    } else {
+      result = `Errors encountered when loading TSDoc configuration:\n`;
+    }
 
     for (const message of this.log.messages) {
       result += `  ${message.text}\n`;

tsdoc-config/src/__tests__/TSDocConfigFile.test.ts

@@ -1,4 +1,4 @@
-import { TSDocConfiguration } from '@microsoft/tsdoc';
+import { Standardization, TSDocConfiguration, TSDocTagDefinition, TSDocTagSyntaxKind } from '@microsoft/tsdoc';
 import * as path from 'path';
 
 import { TSDocConfigFile } from '../TSDocConfigFile';
@@ -207,6 +207,8 @@ test('Load p4', () => {
 
 test('Re-serialize p3', () => {
   const configFile: TSDocConfigFile = TSDocConfigFile.loadForFolder(path.join(__dirname, 'assets/p3'));
+  expect(configFile.hasErrors).toBe(false);
+
   // This is the data from p3/tsdoc.json, ignoring its "extends" field.
   expect(configFile.saveToObject()).toMatchInlineSnapshot(`
     Object {
@@ -229,6 +231,8 @@ test('Re-serialize p3 without defaults', () => {
   parserConfiguration.clear(true);
 
   const defaultsConfigFile: TSDocConfigFile = TSDocConfigFile.loadFromParser(parserConfiguration);
+  expect(defaultsConfigFile.hasErrors).toBe(false);
+
   // This is the default configuration created by the TSDocConfigFile constructor.
   expect(defaultsConfigFile.saveToObject()).toMatchInlineSnapshot(`
     Object {
@@ -238,6 +242,7 @@ test('Re-serialize p3 without defaults', () => {
   `);
 
   const configFile: TSDocConfigFile = TSDocConfigFile.loadForFolder(path.join(__dirname, 'assets/p3'));
+  expect(configFile.hasErrors).toBe(false);
   configFile.noStandardTags = true;
   configFile.configureParser(parserConfiguration);
 
@@ -275,6 +280,8 @@ test('Re-serialize p3 with defaults', () => {
   const parserConfiguration: TSDocConfiguration = new TSDocConfiguration();
 
   const defaultsConfigFile: TSDocConfigFile = TSDocConfigFile.loadFromParser(parserConfiguration);
+  expect(defaultsConfigFile.hasErrors).toBe(false);
+
   // This is the default configuration created by the TSDocConfigFile constructor.
   expect(defaultsConfigFile.saveToObject()).toMatchInlineSnapshot(`
     Object {
@@ -392,6 +399,7 @@ test('Re-serialize p3 with defaults', () => {
   `);
 
   const configFile: TSDocConfigFile = TSDocConfigFile.loadForFolder(path.join(__dirname, 'assets/p3'));
+  expect(configFile.hasErrors).toBe(false);
   configFile.configureParser(parserConfiguration);
 
   const mergedConfigFile: TSDocConfigFile = TSDocConfigFile.loadFromParser(parserConfiguration);
@@ -532,6 +540,7 @@ test('Re-serialize p3 with defaults', () => {
 
 test('Test noStandardTags for p5', () => {
   const configFile: TSDocConfigFile = TSDocConfigFile.loadForFolder(path.join(__dirname, 'assets/p5'));
+  expect(configFile.hasErrors).toBe(false);
 
   const configuration: TSDocConfiguration = new TSDocConfiguration();
   configFile.configureParser(configuration);
@@ -542,6 +551,7 @@ test('Test noStandardTags for p5', () => {
 
 test('Test noStandardTags for p6', () => {
   const configFile: TSDocConfigFile = TSDocConfigFile.loadForFolder(path.join(__dirname, 'assets/p6'));
+  expect(configFile.hasErrors).toBe(false);
 
   const configuration: TSDocConfiguration = new TSDocConfiguration();
   configFile.configureParser(configuration);
@@ -549,3 +559,68 @@ test('Test noStandardTags for p6', () => {
   // noStandardTags=false  because tsdoc.json  overrides tsdoc-base1.json
   expect(configuration.tagDefinitions.length).toBeGreaterThan(0);
 });
+
+test('Test loadFromObject()', () => {
+  const configuration: TSDocConfiguration = new TSDocConfiguration();
+  configuration.clear(true);
+
+  configuration.addTagDefinitions([
+    new TSDocTagDefinition({ syntaxKind: TSDocTagSyntaxKind.ModifierTag, tagName: '@tag1' }),
+    new TSDocTagDefinition({ syntaxKind: TSDocTagSyntaxKind.BlockTag, tagName: '@tag2', allowMultiple: true }),
+    new TSDocTagDefinition({ syntaxKind: TSDocTagSyntaxKind.InlineTag, tagName: '@tag3', allowMultiple: true }),
+  ]);
+
+  configuration.setSupportForTag(configuration.tagDefinitions[0], true);
+
+  const configFile: TSDocConfigFile = TSDocConfigFile.loadFromParser(configuration);
+  expect(configFile.hasErrors).toBe(false);
+  const jsonObject: unknown = configFile.saveToObject();
+
+  const configFile2: TSDocConfigFile = TSDocConfigFile.loadFromObject(jsonObject);
+  expect(configFile2.hasErrors).toBe(false);
+  const jsonObject2: unknown = configFile2.saveToObject();
+
+  expect(jsonObject2).toMatchInlineSnapshot(`
+    Object {
+      "$schema": "https://developer.microsoft.com/json-schemas/tsdoc/v0/tsdoc.schema.json",
+      "noStandardTags": true,
+      "supportForTags": Object {
+        "@tag1": true,
+      },
+      "tagDefinitions": Array [
+        Object {
+          "syntaxKind": "modifier",
+          "tagName": "@tag1",
+        },
+        Object {
+          "allowMultiple": true,
+          "syntaxKind": "block",
+          "tagName": "@tag2",
+        },
+        Object {
+          "allowMultiple": true,
+          "syntaxKind": "inline",
+          "tagName": "@tag3",
+        },
+      ],
+    }
+  `);
+
+  expect(jsonObject2).toStrictEqual(jsonObject);
+});
+
+test('Test loadFromObject() with extends', () => {
+  const configuration: TSDocConfiguration = new TSDocConfiguration();
+  configuration.clear(true);
+
+  const configFile: TSDocConfigFile = TSDocConfigFile.loadFromParser(configuration);
+  expect(configFile.hasErrors).toBe(false);
+  const jsonObject: unknown = configFile.saveToObject();
+
+  // eslint-disable-next-line
+  (jsonObject as any)['extends'] = ['./some-file.json'];
+
+  expect(() => {
+    TSDocConfigFile.loadFromObject(jsonObject);
+  }).toThrowError('The "extends" field cannot be used with TSDocConfigFile.loadFromObject()');
+});