@typescript-runtime-schema/expect-transformer-to-transform-source-code

Expect a transformer to produce certain transpiled code given some source code

Installation

Using npm:

npm install @typescript-runtime-schema/expect-transformer-to-transform-source-code

Using yarn:

yarn add @typescript-runtime-schema/expect-transformer-to-transform-source-code

Setup

Import @typescript-runtime-schema/expect-transformer-to-transform-source-code at the top of your test file:

import '@typescript-runtime-schema/expect-transformer-to-transform-source-code'

Usage

.toTransformSourceCode

expect(transformer).toTransformSourceCode(sourceCode, expectedCodeOutput)

Use .toTransformSourceCode when checking if your typescript transformer can transform the given source code to expected code output

import '@typescript-runtime-schema/expect-transformer-to-transform-source-code'

const sourceCode = `
export const bar = "foo"
`
const expectedCode = `
exports.__esModule = true;
exports.bar = void 0;
exports.bar = "bar";
`

// Reader exercise: Transformer implementation
expect(transformer).toTransformSourceCode(sourceCode, expectedCode)

compilerOptions

expect-transformer-to-transform-source-code uses the following compilerOptions:

{
  "moduleResolution": "node",
  "module": "commonjs",
  "target": "es2020",
}

API

.toTransformSourceCode

expect(transformer).toTransformSourceCode(sourceCode, expectedCodeOutput)

Parameters

Name | Type | Description ------ | ------ | ------ | expect | (ts.Program) => (ts.TransformationContext) => (ts.SourceFile) => ts.SourceFile | The typescript compiler transformation function. sourceCode | string | The source code we're passing through the transformer expectedCodeOutput | string | Our expected output of the transformer

License

MIT License Copyright (c) 2021 Simon Johansson

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.