gen-typescript-declarations


A library which generates TypeScript declarations for Polymer and custom
elements.

How do I use the typings?

$3

Typings for Polymer 3 are included starting from version 3.0.5. To use them,
install @polymer/polymer from npm, and use standard ES module import
specifiers:

``ts
import {PolymerElement} from '@polymer/polymer';

class MyElement extends PolymerElement {
...
}
`

$3

Typings for Polymer 2 are included starting from version 2.4.0. To use them,
install Polymer from Bower and add a triple-slash
directive
anywhere in your TypeScript project for the typings you require. Each HTML
import from Polymer has a corresponding typings file. For example, if you depend
on polymer-element.html:

`ts
///

class MyElement extends Polymer.Element {
...
}
``

Alternatively, you can add the dependency to tsconfig.json in the root of your
project:

`javascript
{
...
"include": [
"src/*/.ts",
"src/bower_components/polymer/*/.d.ts",
]
}
`

You may also be interested in the Polymer
decorators.

How do I generate new typings?

You can run this package from the command line with
gen-typescript-declarations, or as a library with the generateDeclarations
function.

It is recommended to integrate typings generation as part of your build/release
process:

`sh
$ npm install --save-dev @polymer/gen-typescript-declarations
`

Add a generate-typings script to your package.json:

`js
{
...
"scripts": {
"generate-typings": "gen-typescript-declarations"
}
}
`

If you're using NPM, you can add this script to the NPM prepack script to
generate and include typings in your NPM package every time you publish. Most
users will want to configure their .gitignore so that the generated typings
are not committed to their Git repository. In this case, take care to configure
your .npmignore and/or package.json to ensure that they are included when
you publish to NPM (run npm pack to check before publishing).

If you are still using Bower, ensure you run npm run generate-typings to
generate the latest typings and commit them to your repository before tagging
each release.

Config options

By default the gen-typescript-declarations command will read a file called
gen-tsd.json in your root directory. It has the following options:

* excludeFiles: string[]

Skip source files whose paths match any of these glob patterns. If
undefined, defaults to excluding directories ending in "test" or "demo".

* excludeIdentifiers: string[]

Do not emit any declarations for features that have any of these identifiers.

* removeReferences: string[]

Remove any triple-slash references to these files, specified as paths
relative to the analysis root directory.

* addReferences: {[filepath: string]: string[]}

Additional files to insert as triple-slash reference statements. Given the
map a: b[], a will get an additional reference statement for each file
path in b. All paths are relative to the analysis root directory.

* renameTypes: {[name: string]: string}

Whenever a type with a name in this map is encountered, replace it with
the given name. Note this only applies to named types found in places like
function/method parameters and return types. It does not currently rename
e.g. entire generated classes.

* autoImport: {[modulePath: string]: string[]}

A map from an ES module path (relative to the analysis root directory) to
an array of identifiers exported by that module. If any of those
identifiers are encountered in a generated typings file, an import for that
identifier from the specified module will be inserted into the typings
file.

Using as a module

You can also use this package as a module:

`js
import {generateDeclarations} from 'gen-typescript-declarations';

const config = {
"exclude": [
"test/**",
],
"removeReferences": [
"../shadycss/apply-shim.d.ts",
],
"addReferences": {
"lib/utils/boot.d.ts": [
"extra-types.d.ts"
]
},
"renameTypes": {
"Polymer_PropertyEffects": "Polymer.PropertyEffects"
}
}

// A map of d.ts file paths to file contents.
const declarations = await generateDeclarations('/my/root/dir', config);
`

FAQ

$3

This library is based on Polymer
Analyzer which has limitations in
its static analysis. For certain patterns, Analyzer relies on additional JSDoc
annotations.

$3

Yes, see the addReferences` config option above.