[FEATURE]: TypeScript `erasableSyntaxOnly`

[arv]

Node.js can now run a subset of TypeScript without any flags. The subset can be enforced using the tsconfig flag erasableSyntaxOnly. https://www.typescriptlang.org/tsconfig/#erasableSyntaxOnly

Context (Input, Language)

Input Format: any (?)
Output Language: Typescript

Description

Current Behaviour / Output

By default the typescript generator generates enums. This can be dealt with using --prefer-unions flag to quicktype.

However, the converter "classes" have this:

/**
 * @schema X
 */
export class X {
  public static fromNumber(value: number): X {
    return new X(value);
  }
  public static fromString(value: string): X {
    return new X(value);
  }
  private constructor(public readonly value: number | string) {
  }
}

Proposed Behaviour / Output

A better output would be:

/**
 * @schema X
 */
export class X {
  readonly value: number | string;
  
  public static fromNumber(value: number): X {
    return new X(value);
  }
  public static fromString(value: string): X {
    return new X(value);
  }
  
  private constructor(value: number | string) {
    this.value = value;
  }
}

Solution

Maybe add an --erasable-syntax-only and generate compatible code?

Alternatives

Only generate the types...

[vskjt4m5vp-sketch]

Node.js can now run a subset of TypeScript without any flags. The subset can be enforced using the tsconfig flag erasableSyntaxOnly. https://www.typescriptlang.org/tsconfig/#erasableSyntaxOnly

Context (Input, Language)

Input Format: any (?)
Output Language: Typescript

Description

Current Behaviour / Output

By default the typescript generator generates enums. This can be dealt with using --prefer-unions flag to quicktype.

However, the converter "classes" have this:

/**
 * @schema X
 */
export class X {
  public static fromNumber(value: number): X {
    return new X(value);
  }
  public static fromString(value: string): X {
    return new X(value);
  }
  private constructor(public readonly value: number | string) {
  }
}

Proposed Behaviour / Output

A better output would be:

/**
 * @schema X
 */
export class X {
  readonly value: number | string;
  
  public static fromNumber(value: number): X {
    return new X(value);
  }
  public static fromString(value: string): X {
    return new X(value);
  }
  
  private constructor(value: number | string) {
    this.value = value;
  }
}

Solution

Maybe add an --erasable-syntax-only and generate compatible code?

Alternatives

Only generate the types...