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https://github.com/ember-template-lint/ember-template-recast
Non-destructive template transformer.
https://github.com/ember-template-lint/ember-template-recast
Last synced: about 7 hours ago
JSON representation
Non-destructive template transformer.
- Host: GitHub
- URL: https://github.com/ember-template-lint/ember-template-recast
- Owner: ember-template-lint
- License: mit
- Created: 2018-05-10T13:48:53.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2023-06-26T09:58:33.000Z (over 1 year ago)
- Last Synced: 2024-05-03T15:25:12.168Z (6 months ago)
- Language: TypeScript
- Homepage:
- Size: 3.26 MB
- Stars: 40
- Watchers: 7
- Forks: 38
- Open Issues: 25
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
- awesome-ember - ember-template-recast - Non-destructive template transformer. (Packages / AST)
README
# ember-template-recast
[![NPM version](https://img.shields.io/npm/v/ember-template-recast.svg?style=flat)](https://npmjs.org/package/ember-template-recast)
With ember-template-recast, transform a template's AST and reprint it. Its
formatting will be preserved.For instance, it is possible to change a component's property while preserving
its formatting:```js
const recast = require('ember-template-recast');const template = `
`;
// parse
let ast = recast.parse(template);// transform
ast.body[1].attributes[1].value.path = builders.path('this.hmmm');
let ouput = recast.print(ast);output === `
`; // is true!
```## Command Line Usage
ember-template-recast comes with a binary for running a transform across multiple
files, similar to jscodeshift.```sh
npx ember-template-recast directory/of/templates -t transform.js
```Example transform plugin:
```js
module.exports = (env) => {
let { builders: b } = env.syntax;return {
MustacheStatement() {
return b.mustache(b.path('wat-wat'));
},
};
};
```## APIs
### parse
Used to parse a given template string into an AST. Generally speaking, this AST
can be mutated and passed into `print` (docs below).```js
const templateRecast = require('ember-template-recast');
const template = `
{{foo-bar
baz="stuff"
}}
`;
let ast = templateRecast.parse(template);
// now you can work with `ast`
```Used to generate a new template string representing the provided AST.
```js
const templateRecast = require('ember-template-recast');
const template = `
{{foo-bar
baz="stuff"
}}
`;
let ast = templateRecast.parse(template);
ast.body[0].hash[0].key = 'derp';templateRecast.print(ast);
{{foo-bar
derp="stuff"
}}
```### transform
Used to easily traverse (and possibly mutate) a given template. Returns the
resulting AST and the printed template.The plugin argument has roughly the following interface:
```ts
export interface Syntax {
parse: typeof preprocess;
builders: typeof builders;
print: typeof print;
traverse: typeof traverse;
Walker: typeof Walker;
}export interface TransformPluginEnv {
syntax: Syntax;
contents: string;
filePath?: string;
parseOptions: {
srcName?: string;
};
}export interface TransformPluginBuilder {
(env: TransformPluginEnv): NodeVisitor;
}
```The list of known builders on the `env.syntax.builders` are [found
here](https://github.com/glimmerjs/glimmer-vm/blob/v0.82.0/packages/%40glimmer/syntax/lib/v1/public-builders.ts#L530),
although there are a few small extensions related to formatting
[in `custom-nodes.ts`](src/custom-nodes.ts)Example:
```js
const { transform } = require('ember-template-recast');const template = `
{{foo-bar
baz="stuff"
}}
`;let { code } = transform({
template,
plugin(env) {
let { builders: b } = env.syntax;return {
MustacheStatement() {
return b.mustache(b.path('wat-wat'));
},
};
}
});console.log(code); // => {{wat-wat}}
```## SemVer Policy
Due to usage of TypeScript and bundling external APIs this project has somewhat
unique SemVer commitments. A high level summary is:### Major Version
The following are scenarios that would cause a major version (aka breaking change) release:
* Dropping support for Node versions (e.g. dropping Node 12 support)
* Non-additive changes to the underlying AST (which we bundle from `@glimmer/syntax`)
* Breaking changes to the `@glimmer/syntax` builder APIs### Minor Version
The following are scenarios that would cause a minor version (aka new feature) release:
* Changes to TypeScript version used internally by `ember-template-recast`
* Changes to make the types used by `ember-template-recast` to be more accurate
(e.g. narrowing / broadening of previously published types).
* Adding new features### Patch Version
The following are scenarios that would cause a patch release:
* Bug fixes to internal re-writing logic
* Bug fix releases of `@glimmer/syntax`## License
This project is distributed under the MIT license, see [LICENSE](./LICENSE) for details.