ts-transformers

A TypeScript transformer that allows you to extract all values of constant enumurations declarations.

How to use this package

Installation

Install the module as a dev dependency.

npm i -D @vendredix/ts-transformers

How to use enumValues

import {enumValues} from "@vendredix/ts-transformers";

declare const enum Permissions {
  READ = 1,
  WRITE = 2,
  READ_WRITE = READ | WRITE,
}

declare const enum Types {
  TEXT = "text",
  INTEGER = "integer",
}

const permissions = enumValues<Permissions>(); // [1, 2, 3];
const types = enumValues<Types>(); // ["text", "integer"];

How to use type guard functions

import {
  isNull, isUndefined, isNullOrUndefined,
  isBoolean, isNumber, isString, isFunction,
  isPrimitive,
  isArray, isObject, isObjectOrArray,
} from "@vendredix/ts-transformers";

let value: any;

if (isNullOrUndefined(value)) {
  // (value === null || value === undefined)
  // value is null | undefined
}

if (isFunction(value)) {
  // (typeof value === "function")
  // value is a function
}

if (isPrimitive(value)) {
  // (typeof value === "number" || typeof value === "boolean" || typeof value === "string")
  // value is number | boolean | string;
}

if (isObject(value)) {
  // (typeof value === "object" && value !== null && !Array.isArray(value))
  // value is an object and not null
}

How to use this transformer

Using @vendredix/ts-transformer's compiler interface. See tests/tsconfig.json for an example.

Update your tsconfig.json as follows and compile with tstc <tsconfig.json> or use compileByConfig of compiler.ts.

{
  "compilerOptions": {},
  "vendredix": {
    "ts-transformers": {
      "plugins": [
        { "transform": "@vendredix/ts-transformers/transformer.mjs", "kind": ["before"] }
      ]
    }
  }
}

plugin entries described in PluginConfig:

export interface CompilerConfig {
  sourceMapSupport?: boolean;
  plugins?: PluginConfig[];
}
export declare const enum PluginType {
  ProgramBuilder = "builder",
  Program = "program"
}
export declare const enum TransformerKind {
  Before = "before",
  After = "after",
  AfterDeclaration = "afterDeclaration"
}
export interface PluginConfig {
  transform: string;
  import?: string; // whenever it should be a specific exported function
  kind?: TransformerKind[]; // default ["after"]
  type?: PluginType; // default "program"
  [options: string]: unknown;
}

Or using ttypescript. See their repository for more information.

{
    "compilerOptions": {
        "plugins": [
            { "transform": "@vendredix/ts-transformers/transformer.mjs", "type": "program" }
        ]
    }
}

License

MIT