JSDoc string literal types

src/compiler/checker.ts

@@ -5529,6 +5529,8 @@ namespace ts {
                     return getTypeFromThisTypeNode(node);
                 case SyntaxKind.LiteralType:
                     return getTypeFromLiteralTypeNode(<LiteralTypeNode>node);
+                case SyntaxKind.JSDocLiteralType:
+                    return getTypeFromLiteralTypeNode((<JSDocLiteralType>node).literal);
                 case SyntaxKind.TypeReference:
                 case SyntaxKind.JSDocTypeReference:
                     return getTypeFromTypeReference(<TypeReferenceNode>node);

src/compiler/parser.ts

@@ -417,6 +417,8 @@ namespace ts {
             case SyntaxKind.JSDocPropertyTag:
                 return visitNode(cbNode, (<JSDocPropertyTag>node).typeExpression) ||
                     visitNode(cbNode, (<JSDocPropertyTag>node).name);
+            case SyntaxKind.JSDocLiteralType:
+                    return visitNode(cbNode, (<JSDocLiteralType>node).literal);
         }
     }
 
@@ -5889,9 +5891,13 @@ namespace ts {
                     case SyntaxKind.SymbolKeyword:
                     case SyntaxKind.VoidKeyword:
                         return parseTokenNode<JSDocType>();
+                    case SyntaxKind.StringLiteral:
+                    case SyntaxKind.NumericLiteral:
+                    case SyntaxKind.TrueKeyword:
+                    case SyntaxKind.FalseKeyword:
+                        return parseJSDocLiteralType();
                 }
 
-                // TODO (drosen): Parse string literal types in JSDoc as well.
                 return parseJSDocTypeReference();
             }
 
@@ -6070,6 +6076,12 @@ namespace ts {
                 return finishNode(result);
             }
 
+            function parseJSDocLiteralType(): JSDocLiteralType {
+                const result = <JSDocLiteralType>createNode(SyntaxKind.JSDocLiteralType);
+                result.literal = parseLiteralTypeNode();
+                return finishNode(result);
+            }
+
             function parseJSDocUnknownOrNullableType(): JSDocUnknownType | JSDocNullableType {
                 const pos = scanner.getStartPos();
                 // skip the ?

src/compiler/types.ts

@@ -346,6 +346,7 @@ namespace ts {
         JSDocTypedefTag,
         JSDocPropertyTag,
         JSDocTypeLiteral,
+        JSDocLiteralType,
 
         // Synthesized list
         SyntaxList,
@@ -376,9 +377,9 @@ namespace ts {
         LastBinaryOperator = CaretEqualsToken,
         FirstNode = QualifiedName,
         FirstJSDocNode = JSDocTypeExpression,
-        LastJSDocNode = JSDocTypeLiteral,
+        LastJSDocNode = JSDocLiteralType,
         FirstJSDocTagNode = JSDocComment,
-        LastJSDocTagNode = JSDocTypeLiteral
+        LastJSDocTagNode = JSDocLiteralType
     }
 
     export const enum NodeFlags {
@@ -1492,6 +1493,10 @@ namespace ts {
         type: JSDocType;
     }
 
+    export interface JSDocLiteralType extends JSDocType {
+        literal: LiteralTypeNode;
+    }
+
     export type JSDocTypeReferencingNode = JSDocThisType | JSDocConstructorType | JSDocVariadicType | JSDocOptionalType | JSDocNullableType | JSDocNonNullableType;
 
     // @kind(SyntaxKind.JSDocRecordMember)

tests/baselines/reference/jsdocLiteral.js

@@ -0,0 +1,24 @@
+//// [in.js]
+/**
+ * @param {'literal'} p1
+ * @param {"literal"} p2
+ * @param {'literal' | 'other'} p3
+ * @param {'literal' | number} p4
+ * @param {12 | true | 'str'} p5
+ */
+function f(p1, p2, p3, p4, p5) {
+    return p1 + p2 + p3 + p4 + p5 + '.';
+}
+
+
+//// [out.js]
+/**
+ * @param {'literal'} p1
+ * @param {"literal"} p2
+ * @param {'literal' | 'other'} p3
+ * @param {'literal' | number} p4
+ * @param {12 | true | 'str'} p5
+ */
+function f(p1, p2, p3, p4, p5) {
+    return p1 + p2 + p3 + p4 + p5 + '.';
+}

tests/baselines/reference/jsdocLiteral.symbols

@@ -0,0 +1,24 @@
+=== tests/cases/conformance/jsdoc/in.js ===
+/**
+ * @param {'literal'} p1
+ * @param {"literal"} p2
+ * @param {'literal' | 'other'} p3
+ * @param {'literal' | number} p4
+ * @param {12 | true | 'str'} p5
+ */
+function f(p1, p2, p3, p4, p5) {
+>f : Symbol(f, Decl(in.js, 0, 0))
+>p1 : Symbol(p1, Decl(in.js, 7, 11))
+>p2 : Symbol(p2, Decl(in.js, 7, 14))
+>p3 : Symbol(p3, Decl(in.js, 7, 18))
+>p4 : Symbol(p4, Decl(in.js, 7, 22))
+>p5 : Symbol(p5, Decl(in.js, 7, 26))
+
+    return p1 + p2 + p3 + p4 + p5 + '.';
+>p1 : Symbol(p1, Decl(in.js, 7, 11))
+>p2 : Symbol(p2, Decl(in.js, 7, 14))
+>p3 : Symbol(p3, Decl(in.js, 7, 18))
+>p4 : Symbol(p4, Decl(in.js, 7, 22))
+>p5 : Symbol(p5, Decl(in.js, 7, 26))
+}
+

tests/baselines/reference/jsdocLiteral.types

@@ -0,0 +1,30 @@
+=== tests/cases/conformance/jsdoc/in.js ===
+/**
+ * @param {'literal'} p1
+ * @param {"literal"} p2
+ * @param {'literal' | 'other'} p3
+ * @param {'literal' | number} p4
+ * @param {12 | true | 'str'} p5
+ */
+function f(p1, p2, p3, p4, p5) {
+>f : (p1: "literal", p2: "literal", p3: "literal" | "other", p4: number | "literal", p5: true | 12 | "str") => string
+>p1 : "literal"
+>p2 : "literal"
+>p3 : "literal" | "other"
+>p4 : number | "literal"
+>p5 : true | 12 | "str"
+
+    return p1 + p2 + p3 + p4 + p5 + '.';
+>p1 + p2 + p3 + p4 + p5 + '.' : string
+>p1 + p2 + p3 + p4 + p5 : string
+>p1 + p2 + p3 + p4 : string
+>p1 + p2 + p3 : string
+>p1 + p2 : string
+>p1 : "literal"
+>p2 : "literal"
+>p3 : "literal" | "other"
+>p4 : number | "literal"
+>p5 : true | 12 | "str"
+>'.' : string
+}
+

tests/cases/conformance/jsdoc/jsdocLiteral.ts

@@ -0,0 +1,13 @@
+// @allowJs: true
+// @filename: in.js
+// @out: out.js
+/**
+ * @param {'literal'} p1
+ * @param {"literal"} p2
+ * @param {'literal' | 'other'} p3
+ * @param {'literal' | number} p4
+ * @param {12 | true | 'str'} p5
+ */
+function f(p1, p2, p3, p4, p5) {
+    return p1 + p2 + p3 + p4 + p5 + '.';
+}

tests/cases/fourslash/completionForStringLiteral4.ts

@@ -0,0 +1,23 @@
+/// <reference path='fourslash.ts'/>
+// @allowJs: true
+// @Filename: in.js
+/////** I am documentation
+//// * @param {'literal'} p1
+//// * @param {"literal"} p2
+//// * @param {'other1' | 'other2'} p3
+//// * @param {'literal' | number} p4
+//// * @param {12 | true} p5
+//// */
+////function f(p1, p2, p3, p4, p5) {
+////    return p1 + p2 + p3 + p4 + p5 + '.';
+////}
+////f/*1*/('literal', 'literal', "o/*2*/ther1", 12);
+
+goTo.marker('1');
+verify.quickInfoExists();
+verify.quickInfoIs('function f(p1: "literal", p2: "literal", p3: "other1" | "other2", p4: number | "literal", p5: true | 12): string', 'I am documentation');
+
+goTo.marker('2');
+verify.completionListContains("other1");
+verify.completionListContains("other2");
+verify.memberListCount(2);