babel-generator: Add TypeScript support (#5896)

* babel-generator: Add TypeScript support

* Remove type declarations; not published from babylon

* Remove TODOs

* Consistently use `this.word` for tokens that are words

packages/babel-generator/test/fixtures/typescript/arrow-function-annotated/actual.js

@@ -0,0 +1 @@
+(x: number): number => x;

packages/babel-generator/test/fixtures/typescript/arrow-function-annotated/expected.js

@@ -0,0 +1 @@
+(x: number): number => x;

packages/babel-generator/test/fixtures/typescript/arrow-function-async-generic-false-positive/actual.js

@@ -0,0 +1,2 @@
+async < 1;
+async<T>() == 0;

packages/babel-generator/test/fixtures/typescript/arrow-function-async-generic-false-positive/expected.js

@@ -0,0 +1,2 @@
+async < 1;
+async<T>() == 0;

packages/babel-generator/test/fixtures/typescript/arrow-function-async-generic/actual.js

@@ -0,0 +1 @@
+async <T>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-async-generic/expected.js

@@ -0,0 +1 @@
+async <T>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-async/actual.js

@@ -0,0 +1 @@
+async (x?: number): any => x;

packages/babel-generator/test/fixtures/typescript/arrow-function-async/expected.js

@@ -0,0 +1 @@
+async (x?: number): any => x;

packages/babel-generator/test/fixtures/typescript/arrow-function-default-parameter-values/actual.js

@@ -0,0 +1 @@
+(x: number = 0) => 0;

packages/babel-generator/test/fixtures/typescript/arrow-function-default-parameter-values/expected.js

@@ -0,0 +1 @@
+(x: number = 0) => 0;

packages/babel-generator/test/fixtures/typescript/arrow-function-destructuring/actual.js

@@ -0,0 +1 @@
+({ a = 0 }) => 0;

packages/babel-generator/test/fixtures/typescript/arrow-function-destructuring/expected.js

@@ -0,0 +1,3 @@
+({
+  a = 0
+}) => 0;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic-tsx/actual.js

@@ -0,0 +1,2 @@
+// Same as `generic`. Verify that JSX doesn't change things.
+<T>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic-tsx/expected.js

@@ -0,0 +1,2 @@
+// Same as `generic`. Verify that JSX doesn't change things.
+<T>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic-tsx/options.json

@@ -0,0 +1,3 @@
+{
+    "plugins": ["jsx", "typescript"]
+}

packages/babel-generator/test/fixtures/typescript/arrow-function-generic/actual.js

@@ -0,0 +1 @@
+<T>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic/expected.js

@@ -0,0 +1 @@
+<T>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-optional-parameter/actual.js

@@ -0,0 +1 @@
+(x?: number): any => x;

packages/babel-generator/test/fixtures/typescript/arrow-function-optional-parameter/expected.js

@@ -0,0 +1 @@
+(x?: number): any => x;

packages/babel-generator/test/fixtures/typescript/arrow-function-predicate-types/actual.js

@@ -0,0 +1 @@
+(x: any): x is string => true;

packages/babel-generator/test/fixtures/typescript/arrow-function-predicate-types/expected.js

@@ -0,0 +1 @@
+(x: any): x is string => true;

packages/babel-generator/test/fixtures/typescript/cast-as/actual.js

@@ -0,0 +1,4 @@
+x as T;
+x < y as boolean; // (x < y) as boolean;
+x === 1 as number; // x === (1 as number);
+x as any as T;

packages/babel-generator/test/fixtures/typescript/cast-as/expected.js

@@ -0,0 +1,6 @@
+(x as T);
+(x < y as boolean); // (x < y) as boolean;
+
+x === (1 as number); // x === (1 as number);
+
+((x as any) as T);

packages/babel-generator/test/fixtures/typescript/cast-false-positive/actual.js

@@ -0,0 +1 @@
+f(x < 0, /a/);

packages/babel-generator/test/fixtures/typescript/cast-false-positive/expected.js

@@ -0,0 +1 @@
+f(x < 0, /a/);

packages/babel-generator/test/fixtures/typescript/cast-need-parentheses/actual.js

@@ -0,0 +1,3 @@
+(<T> x).y;
+(x as T).y;
+x!.y;

packages/babel-generator/test/fixtures/typescript/cast-need-parentheses/expected.js

@@ -0,0 +1,3 @@
+(<T> x).y;
+(x as T).y;
+x!.y;

packages/babel-generator/test/fixtures/typescript/cast-null-assertion-then-property-access/actual.js

@@ -0,0 +1 @@
+x!.y;

packages/babel-generator/test/fixtures/typescript/cast-null-assertion-then-property-access/expected.js

@@ -0,0 +1 @@
+x!.y;

packages/babel-generator/test/fixtures/typescript/cast-null-assertion/actual.js

@@ -0,0 +1 @@
+x!;

packages/babel-generator/test/fixtures/typescript/cast-null-assertion/expected.js

@@ -0,0 +1 @@
+x!;

packages/babel-generator/test/fixtures/typescript/cast-type-assertion-after-operator/actual.js

@@ -0,0 +1 @@
+1 + <number> 1;

packages/babel-generator/test/fixtures/typescript/cast-type-assertion-after-operator/expected.js

@@ -0,0 +1 @@
+1 + (<number> 1);

packages/babel-generator/test/fixtures/typescript/cast-type-assertion-before-operator/actual.js

@@ -0,0 +1 @@
+<number> 1 + 1;

packages/babel-generator/test/fixtures/typescript/cast-type-assertion-before-operator/expected.js

@@ -0,0 +1 @@
+(<number> 1) + 1;

packages/babel-generator/test/fixtures/typescript/cast-type-assertion/actual.js

@@ -0,0 +1 @@
+<number> 1;

packages/babel-generator/test/fixtures/typescript/cast-type-assertion/expected.js

@@ -0,0 +1 @@
+(<number> 1);

packages/babel-generator/test/fixtures/typescript/class-abstract/actual.js

@@ -0,0 +1,6 @@
+abstract class C {}
+declare abstract class C {}
+export abstract class C {}
+// `export abstract class { }` is not valid.
+// `export default abstract class C { }` is not valid.
+// `abstract class` is not valid as an expression.

packages/babel-generator/test/fixtures/typescript/class-abstract/expected.js

@@ -0,0 +1,7 @@
+abstract class C {}
+
+declare abstract class C {}
+
+export abstract class C {} // `export abstract class { }` is not valid.
+// `export default abstract class C { }` is not valid.
+// `abstract class` is not valid as an expression.

packages/babel-generator/test/fixtures/typescript/class-constructor/actual.js

@@ -0,0 +1,5 @@
+class C {
+    constructor(x: number, y: number);
+    constructor(x: string, y: string);
+    constructor(x: any, y: any) {}
+}

packages/babel-generator/test/fixtures/typescript/class-constructor/expected.js

@@ -0,0 +1,7 @@
+class C {
+  constructor(x: number, y: number);
+  constructor(x: string, y: string);
+
+  constructor(x: any, y: any) {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-declare/actual.js

@@ -0,0 +1,7 @@
+declare class C {
+    [x: string]: any;
+    x;
+    x: number;
+    f();
+    f(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-declare/expected.js

@@ -0,0 +1,7 @@
+declare class C {
+  [x: string]: any;
+  x;
+  x: number;
+  f();
+  f(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-expression-extends-implements/actual.js

@@ -0,0 +1,2 @@
+(class extends f()<T> implements X.Y<T> {});
+(class C extends f()<T> implements X.Y<T> {});

packages/babel-generator/test/fixtures/typescript/class-expression-extends-implements/expected.js

@@ -0,0 +1,3 @@
+(class extends f()<T> implements X.Y<T> {});
+
+(class C extends f()<T> implements X.Y<T> {});

packages/babel-generator/test/fixtures/typescript/class-expression-extends/actual.js

@@ -0,0 +1,2 @@
+(class extends f()<T> {});
+(class C extends f()<T> {});

packages/babel-generator/test/fixtures/typescript/class-expression-extends/expected.js

@@ -0,0 +1,3 @@
+(class extends f()<T> {});
+
+(class C extends f()<T> {});

packages/babel-generator/test/fixtures/typescript/class-expression-generic/actual.js

@@ -0,0 +1,2 @@
+(class<T> {});
+(class C<T> {});

packages/babel-generator/test/fixtures/typescript/class-expression-generic/expected.js

@@ -0,0 +1,3 @@
+(class<T> {});
+
+(class C<T> {});

packages/babel-generator/test/fixtures/typescript/class-expression-implements/actual.js

@@ -0,0 +1,2 @@
+(class implements X.Y<T> {});
+(class C implements X.Y<T> {});

packages/babel-generator/test/fixtures/typescript/class-expression-implements/expected.js

@@ -0,0 +1,3 @@
+(class implements X.Y<T> {});
+
+(class C implements X.Y<T> {});

packages/babel-generator/test/fixtures/typescript/class-extends-implements/actual.js

@@ -0,0 +1 @@
+class C extends f()<T> implements X.Y<T> {}

packages/babel-generator/test/fixtures/typescript/class-extends-implements/expected.js

@@ -0,0 +1 @@
+class C extends f()<T> implements X.Y<T> {}

packages/babel-generator/test/fixtures/typescript/class-extends/actual.js

@@ -0,0 +1 @@
+class C extends f()<T> {}

packages/babel-generator/test/fixtures/typescript/class-extends/expected.js

@@ -0,0 +1 @@
+class C extends f()<T> {}

packages/babel-generator/test/fixtures/typescript/class-generic/actual.js

@@ -0,0 +1 @@
+class C<T extends object = { x: number }> {}

packages/babel-generator/test/fixtures/typescript/class-generic/expected.js

@@ -0,0 +1,3 @@
+class C<T extends object = {
+  x: number;
+}> {}

packages/babel-generator/test/fixtures/typescript/class-get-generic/actual.js

@@ -0,0 +1,3 @@
+declare class C {
+    get<T>(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-get-generic/expected.js

@@ -0,0 +1,3 @@
+declare class C {
+  get<T>(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-implements/actual.js

@@ -0,0 +1 @@
+class C implements X.Y<T> {}

packages/babel-generator/test/fixtures/typescript/class-implements/expected.js

@@ -0,0 +1 @@
+class C implements X.Y<T> {}

packages/babel-generator/test/fixtures/typescript/class-index-signature/actual.js

@@ -0,0 +1,4 @@
+class C {
+    [x: string]: any;
+    readonly [x: string]: any;
+}

packages/babel-generator/test/fixtures/typescript/class-index-signature/expected.js

@@ -0,0 +1,4 @@
+class C {
+  [x: string]: any;
+  readonly [x: string]: any;
+}

packages/babel-generator/test/fixtures/typescript/class-members-with-modifier-names/actual.js

@@ -0,0 +1,6 @@
+class C {
+    public(): void;
+    public static(): void;
+    readonly = 0;
+    async<T>(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-members-with-modifier-names/expected.js

@@ -0,0 +1,6 @@
+class C {
+  public(): void;
+  public static(): void;
+  readonly = 0;
+  async<T>(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-members-with-reserved-names/actual.js

@@ -0,0 +1,3 @@
+class C {
+    public delete(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-members-with-reserved-names/expected.js

@@ -0,0 +1,3 @@
+class C {
+  public delete(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-method-computed/actual.js

@@ -0,0 +1,4 @@
+class C {
+    [Symbol.iterator](): void;
+    [Symbol.iterator]?(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-method-computed/expected.js

@@ -0,0 +1,4 @@
+class C {
+  [Symbol.iterator](): void;
+  [Symbol.iterator]?(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-method-generic/actual.js

@@ -0,0 +1,4 @@
+class C {
+    f<T>(a: T, b?: T, ...c: T[]): T {}
+    [Symbol.iterator]<T>(): T {}
+}

packages/babel-generator/test/fixtures/typescript/class-method-generic/expected.js

@@ -0,0 +1,6 @@
+class C {
+  f<T>(a: T, b?: T, ...c: T[]): T {}
+
+  [Symbol.iterator]<T>(): T {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-method-no-body/actual.js

@@ -0,0 +1,4 @@
+class C {
+    f();
+    f(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-method-no-body/expected.js

@@ -0,0 +1,4 @@
+class C {
+  f();
+  f(): void;
+}

packages/babel-generator/test/fixtures/typescript/class-method-optional/actual.js

@@ -0,0 +1,3 @@
+class C {
+    m?(): void {}
+}

packages/babel-generator/test/fixtures/typescript/class-method-optional/expected.js

@@ -0,0 +1,4 @@
+class C {
+  m?(): void {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-method-return-type/actual.js

@@ -0,0 +1,3 @@
+class C {
+    f(): void {}
+}

packages/babel-generator/test/fixtures/typescript/class-method-return-type/expected.js

@@ -0,0 +1,4 @@
+class C {
+  f(): void {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-method-with-newline-with-body/actual.js

@@ -0,0 +1,6 @@
+class C
+{
+    m()
+    {
+    }
+}

packages/babel-generator/test/fixtures/typescript/class-method-with-newline-with-body/expected.js

@@ -0,0 +1,4 @@
+class C {
+  m() {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-method-with-newline-without-body/actual.js

@@ -0,0 +1,5 @@
+class C
+{
+    m()
+    n()
+}

packages/babel-generator/test/fixtures/typescript/class-method-with-newline-without-body/expected.js

@@ -0,0 +1,4 @@
+class C {
+  m();
+  n();
+}

packages/babel-generator/test/fixtures/typescript/class-modifiers-accessors/actual.js

@@ -0,0 +1,11 @@
+// Copy of modifiers-methods with 'get'
+abstract class C {
+    abstract get a();
+    static get s() { return 0; }
+    public abstract get pua();
+    public static get pus() { return 0; }
+
+    public get pu() { return 0; }
+    protected get po() { return 0; }
+    private get pi() { return 0; }
+}

packages/babel-generator/test/fixtures/typescript/class-modifiers-accessors/expected.js

@@ -0,0 +1,27 @@
+// Copy of modifiers-methods with 'get'
+abstract class C {
+  abstract get a();
+
+  static get s() {
+    return 0;
+  }
+
+  public abstract get pua();
+
+  public static get pus() {
+    return 0;
+  }
+
+  public get pu() {
+    return 0;
+  }
+
+  protected get po() {
+    return 0;
+  }
+
+  private get pi() {
+    return 0;
+  }
+
+}

packages/babel-generator/test/fixtures/typescript/class-modifiers-methods-async/actual.js

@@ -0,0 +1,11 @@
+// Copy of modifiers-methods with 'async'
+abstract class C {
+    abstract async a();
+    static async s() {}
+    public abstract async pua();
+    public static async pus() {}
+
+    public async pu() {}
+    protected async po() {}
+    private async pi() {}
+}

packages/babel-generator/test/fixtures/typescript/class-modifiers-methods-async/expected.js

@@ -0,0 +1,17 @@
+// Copy of modifiers-methods with 'async'
+abstract class C {
+  abstract async a();
+
+  static async s() {}
+
+  public abstract async pua();
+
+  public static async pus() {}
+
+  public async pu() {}
+
+  protected async po() {}
+
+  private async pi() {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-modifiers-properties/actual.js

@@ -0,0 +1,21 @@
+abstract class C {
+    readonly r;
+    readonly r2?: number;
+    abstract a;
+    static s;
+
+    public pu;
+    protected po;
+    private pi;
+
+    readonly abstract ra;
+    abstract readonly ar;
+    static readonly sr;
+
+    public readonly pur;
+    public abstract pua;
+    public static pus;
+    public readonly abstract pura;
+    public abstract readonly puar;
+    public static readonly pusr;
+}

packages/babel-generator/test/fixtures/typescript/class-modifiers-properties/expected.js

@@ -0,0 +1,18 @@
+abstract class C {
+  readonly r;
+  readonly r2?: number;
+  abstract a;
+  static s;
+  public pu;
+  protected po;
+  private pi;
+  abstract readonly ra;
+  abstract readonly ar;
+  static readonly sr;
+  public readonly pur;
+  public abstract pua;
+  public static pus;
+  public abstract readonly pura;
+  public abstract readonly puar;
+  public static readonly pusr;
+}

packages/babel-generator/test/fixtures/typescript/class-parameter-properties-with-decorators/actual.js

@@ -0,0 +1,3 @@
+class C {
+    constructor(@foo readonly x: number) {}
+}

packages/babel-generator/test/fixtures/typescript/class-parameter-properties-with-decorators/expected.js

@@ -0,0 +1,5 @@
+class C {
+  constructor(@foo
+  readonly x: number) {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-parameter-properties-with-decorators/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["typescript", "decorators"]
+}

packages/babel-generator/test/fixtures/typescript/class-parameter-properties/actual.js

@@ -0,0 +1,11 @@
+class C {
+    constructor(
+        readonly r,
+        public pu: number,
+        protected po?,
+        private pi?: number,
+        public readonly pur,
+        // Also works on AssignmentPattern
+        readonly x = 0,
+        public y?: number = 0) {}
+}

packages/babel-generator/test/fixtures/typescript/class-parameter-properties/expected.js

@@ -0,0 +1,5 @@
+class C {
+  constructor(readonly r, public pu: number, protected po?, private pi?: number, public readonly pur, // Also works on AssignmentPattern
+  readonly x = 0, public y?: number = 0) {}
+
+}

packages/babel-generator/test/fixtures/typescript/class-properties/actual.js

@@ -0,0 +1,6 @@
+class C {
+    x;
+    x?;
+    x: number;
+    x: number = 1;
+}

packages/babel-generator/test/fixtures/typescript/class-properties/expected.js

@@ -0,0 +1,6 @@
+class C {
+  x;
+  x?;
+  x: number;
+  x: number = 1;
+}

packages/babel-generator/test/fixtures/typescript/class-property-computed/actual.js

@@ -0,0 +1,4 @@
+class C {
+    [Symbol.iterator]: number;
+    [Symbol.iterator]?: number;
+}

packages/babel-generator/test/fixtures/typescript/class-property-computed/expected.js

@@ -0,0 +1,4 @@
+class C {
+  [Symbol.iterator]: number;
+  [Symbol.iterator]?: number;
+}

packages/babel-generator/test/fixtures/typescript/class-static/actual.js

@@ -0,0 +1,6 @@
+class C {
+    static f();
+    public static f();
+    protected static f();
+    private static f();
+}

packages/babel-generator/test/fixtures/typescript/class-static/expected.js

@@ -0,0 +1,6 @@
+class C {
+  static f();
+  public static f();
+  protected static f();
+  private static f();
+}

packages/babel-generator/test/fixtures/typescript/const-no-initializer/actual.js

@@ -0,0 +1 @@
+const x: number;

packages/babel-generator/test/fixtures/typescript/const-no-initializer/expected.js

@@ -0,0 +1 @@
+const x: number;