docs: check and improve handling of duplicate tags

scripts/apidoc/typedoc.ts

@@ -219,7 +219,40 @@ export function extractTagContent(
   reflection?: CommentHolder,
   tagProcessor: (tag: CommentTag) => string[] = joinTagContent
 ): string[] {
-  return reflection?.comment?.getTags(tag).flatMap(tagProcessor) ?? [];
+  const tags =
+    reflection?.comment
+      ?.getTags(tag)
+      .flatMap(tagProcessor)
+      .map((tag) => tag.trim()) ?? [];
+  if (tags.some((tag) => tag.length === 0)) {
+    throw new Error(`Expected non-empty ${tag} tag.`);
+  }
+
+  return tags;
+}
+
+/**
+ * Extracts the text (md) from a single jsdoc tag.
+ *
+ * @param tag The tag to extract the text from.
+ * @param reflection The reflection to extract the text from.
+ * @param tagProcessor The function used to extract the text from the tag.
+ *
+ * @throws If there are multiple tags of that type.
+ */
+function extractSingleTagContent(
+  tag: `@${string}`,
+  reflection?: CommentHolder,
+  tagProcessor: (tag: CommentTag) => string[] = joinTagContent
+): string | undefined {
+  const tags = extractTagContent(tag, reflection, tagProcessor);
+  if (tags.length === 0) {
+    return undefined;
+  } else if (tags.length === 1) {
+    return tags[0];
+  }
+
+  throw new Error(`Expected 1 ${tag} tag, but got ${tags.length}.`);
 }
 
 /**
@@ -358,8 +391,7 @@ export function joinTagParts(parts?: CommentDisplayPart[]): string | undefined {
 export function extractDeprecated(
   reflection?: CommentHolder
 ): string | undefined {
-  const deprecated = extractTagContent('@deprecated', reflection).join().trim();
-  return deprecated.length === 0 ? undefined : deprecated;
+  return extractSingleTagContent('@deprecated', reflection);
 }
 
 /**
@@ -370,8 +402,8 @@ export function extractDeprecated(
  * @returns The message explaining the conditions when this method throws. Or `undefined` if it does not throw.
  */
 export function extractThrows(reflection?: CommentHolder): string | undefined {
-  const throws = extractTagContent('@throws', reflection).join().trim();
-  return throws.length === 0 ? undefined : throws;
+  const content = extractTagContent('@throws', reflection).join('\n');
+  return content.length === 0 ? undefined : content;
 }
 
 /**
@@ -382,5 +414,5 @@ export function extractThrows(reflection?: CommentHolder): string | undefined {
  * @returns The contents of the `@since` tag.
  */
 export function extractSince(reflection: CommentHolder): string {
-  return extractTagContent('@since', reflection).join().trim();
+  return extractSingleTagContent('@since', reflection) || MISSING_DESCRIPTION;
 }

src/modules/helpers/index.ts

@@ -417,8 +417,8 @@ export class SimpleHelpersModule extends SimpleModuleBase {
    *
    * @param pattern The template string/RegExp to generate a matching string for.
    *
-   * @throws If min value is more than max value in quantifier. e.g. `#{10,5}`
-   * @throws If invalid quantifier symbol is passed in.
+   * @throws If min value is more than max value in quantifier, e.g. `#{10,5}`.
+   * @throws If an invalid quantifier symbol is passed in.
    *
    * @example
    * faker.helpers.fromRegExp('#{5}') // '#####'

test/scripts/apidoc/__snapshots__/signature.spec.ts.snap

@@ -42,8 +42,8 @@ exports[`signature > analyzeSignature() > complexArrayParameter 1`] = `
   ],
   "returns": "T",
   "seeAlsos": [],
-  "since": "",
-  "sourcePath": "test/scripts/apidoc/signature.example.ts#L367",
+  "since": "Missing",
+  "sourcePath": "test/scripts/apidoc/signature.example.ts#L377",
   "throws": undefined,
 }
 `;
@@ -67,7 +67,7 @@ exports[`signature > analyzeSignature() > defaultBooleanParamMethod 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L105",
   "throws": undefined,
 }
@@ -84,6 +84,7 @@ exports[`signature > analyzeSignature() > expected and actual methods are equal
   "methodWithExample",
   "methodWithMultipleSeeMarkers",
   "methodWithMultipleSeeMarkersAndBackticks",
+  "methodWithMultipleThrows",
   "methodWithSinceMarker",
   "methodWithThrows",
   "multiParamMethod",
@@ -118,7 +119,7 @@ exports[`signature > analyzeSignature() > functionParamMethod 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L125",
   "throws": undefined,
 }
@@ -178,7 +179,7 @@ exports[`signature > analyzeSignature() > literalUnionParamMethod 1`] = `
   ],
   "returns": "string",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L159",
   "throws": undefined,
 }
@@ -198,7 +199,7 @@ exports[`signature > analyzeSignature() > methodWithDeprecated 1`] = `
   "seeAlsos": [
     "test.apidoc.methodWithExample()",
   ],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L287",
   "throws": undefined,
 }
@@ -250,8 +251,8 @@ exports[`signature > analyzeSignature() > methodWithDeprecatedOption 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
-  "sourcePath": "test/scripts/apidoc/signature.example.ts#L308",
+  "since": "Missing",
+  "sourcePath": "test/scripts/apidoc/signature.example.ts#L318",
   "throws": undefined,
 }
 `;
@@ -268,7 +269,7 @@ exports[`signature > analyzeSignature() > methodWithExample 1`] = `
   "parameters": [],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L276",
   "throws": undefined,
 }
@@ -288,8 +289,8 @@ exports[`signature > analyzeSignature() > methodWithMultipleSeeMarkers 1`] = `
     "test.apidoc.methodWithExample()",
     "test.apidoc.methodWithDeprecated()",
   ],
-  "since": "",
-  "sourcePath": "test/scripts/apidoc/signature.example.ts#L335",
+  "since": "Missing",
+  "sourcePath": "test/scripts/apidoc/signature.example.ts#L345",
   "throws": undefined,
 }
 `;
@@ -308,12 +309,30 @@ exports[`signature > analyzeSignature() > methodWithMultipleSeeMarkersAndBacktic
     "test.apidoc.methodWithExample() with parameter <code>foo</code>.",
     "test.apidoc.methodWithDeprecated() with parameter <code>bar</code> and <code>baz</code>.",
   ],
-  "since": "",
-  "sourcePath": "test/scripts/apidoc/signature.example.ts#L345",
+  "since": "Missing",
+  "sourcePath": "test/scripts/apidoc/signature.example.ts#L355",
   "throws": undefined,
 }
 `;
 
+exports[`signature > analyzeSignature() > methodWithMultipleThrows 1`] = `
+{
+  "deprecated": undefined,
+  "description": "<p>Test with multiple throws.</p>
+",
+  "examples": "<div class=\\"language-ts\\"><button title=\\"Copy Code\\" class=\\"copy\\"></button><span class=\\"lang\\">ts</span><pre v-pre class=\\"shiki material-theme-palenight\\"><code><span class=\\"line\\"><span style=\\"color:#82AAFF\\">methodWithMultipleThrows</span><span style=\\"color:#BABED8\\">(): number</span></span></code></pre>
+</div>",
+  "name": "methodWithMultipleThrows",
+  "parameters": [],
+  "returns": "number",
+  "seeAlsos": [],
+  "since": "Missing",
+  "sourcePath": "test/scripts/apidoc/signature.example.ts#L306",
+  "throws": "First error case.
+Another error case.",
+}
+`;
+
 exports[`signature > analyzeSignature() > methodWithSinceMarker 1`] = `
 {
   "deprecated": undefined,
@@ -326,25 +345,25 @@ exports[`signature > analyzeSignature() > methodWithSinceMarker 1`] = `
   "returns": "number",
   "seeAlsos": [],
   "since": "1.0.0",
-  "sourcePath": "test/scripts/apidoc/signature.example.ts#L354",
+  "sourcePath": "test/scripts/apidoc/signature.example.ts#L364",
   "throws": undefined,
 }
 `;
 
 exports[`signature > analyzeSignature() > methodWithThrows 1`] = `
 {
   "deprecated": undefined,
-  "description": "<p>Test with throws</p>
+  "description": "<p>Test with throws.</p>
 ",
   "examples": "<div class=\\"language-ts\\"><button title=\\"Copy Code\\" class=\\"copy\\"></button><span class=\\"lang\\">ts</span><pre v-pre class=\\"shiki material-theme-palenight\\"><code><span class=\\"line\\"><span style=\\"color:#82AAFF\\">methodWithThrows</span><span style=\\"color:#BABED8\\">(): number</span></span></code></pre>
 </div>",
   "name": "methodWithThrows",
   "parameters": [],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L296",
-  "throws": "a Faker error",
+  "throws": "Everytime.",
 }
 `;
 
@@ -381,7 +400,7 @@ exports[`signature > analyzeSignature() > multiParamMethod 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L116",
   "throws": undefined,
 }
@@ -398,7 +417,7 @@ exports[`signature > analyzeSignature() > noParamMethod 1`] = `
   "parameters": [],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L78",
   "throws": undefined,
 }
@@ -423,7 +442,7 @@ exports[`signature > analyzeSignature() > optionalStringParamMethod 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L96",
   "throws": undefined,
 }
@@ -491,7 +510,7 @@ It also has a more complex description.</p>
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L226",
   "throws": undefined,
 }
@@ -530,7 +549,7 @@ exports[`signature > analyzeSignature() > optionsInterfaceParamMethodWithDefault
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L262",
   "throws": undefined,
 }
@@ -596,7 +615,7 @@ exports[`signature > analyzeSignature() > optionsParamMethod 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L196",
   "throws": undefined,
 }
@@ -635,7 +654,7 @@ exports[`signature > analyzeSignature() > optionsTypeParamMethodWithDefaults 1`]
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L244",
   "throws": undefined,
 }
@@ -660,7 +679,7 @@ exports[`signature > analyzeSignature() > recordParamMethod 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L182",
   "throws": undefined,
 }
@@ -685,7 +704,7 @@ exports[`signature > analyzeSignature() > requiredNumberParamMethod 1`] = `
   ],
   "returns": "number",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L87",
   "throws": undefined,
 }
@@ -742,7 +761,7 @@ exports[`signature > analyzeSignature() > stringUnionParamMethod 1`] = `
   ],
   "returns": "string",
   "seeAlsos": [],
-  "since": "",
+  "since": "Missing",
   "sourcePath": "test/scripts/apidoc/signature.example.ts#L138",
   "throws": undefined,
 }

test/scripts/apidoc/signature.example.ts

@@ -289,14 +289,24 @@ export class SignatureTest {
   }
 
   /**
-   * Test with throws
+   * Test with throws.
    *
-   * @throws a Faker error
+   * @throws Everytime.
    */
   methodWithThrows(): number {
     throw new FakerError('Test error');
   }
 
+  /**
+   * Test with multiple throws.
+   *
+   * @throws First error case.
+   * @throws Another error case.
+   */
+  methodWithMultipleThrows(): number {
+    throw new FakerError('Another test error');
+  }
+
   /**
    * Test with deprecated option.
    *

test/scripts/apidoc/verify-jsdoc-tags.spec.ts

@@ -300,6 +300,7 @@ describe('verify JSDoc tags', () => {
           it('verify @since tag', () => {
             const since = extractSince(signature);
             expect(since, '@since to be present').toBeTruthy();
+            expect(since).not.toBe(MISSING_DESCRIPTION);
             expect(since, '@since to be a valid semver').toSatisfy(
               validator.isSemVer
             );