ts-create-index

Forked from: https://github.com/gajus/create-index

Installation

npm i -D ts-create-index

or

yarn add -D ts-create-index

What's different?

• Will now output export * from './foo'; (instead of export { default as foo } from './foo.ts';)
• Only writes files if their contents have changed
• This readme and all the unit tests have been updated so they are accurate
• Adds a TsCreateIndexWebpackPlugin

---

TsCreateIndexWebpackPlugin

// webpack.config.js

import { TsCreateIndexWebpackPlugin } from 'ts-create-index';

module.exports = {
  plugins: [
    // Whenever webpack recompiles, a new index.ts file will be generated in the root of these dirs
    new TsCreateIndexWebpackPlugin({ dirs: ['src/components'] }),
  ]
}

---

ts-create-index program creates (and maintains) ES6 ./index.ts file in target directories that imports and exports sibling files and directories.

Example

> tree ./
./
├── bar.ts
└── foo.ts

0 directories, 2 files

> ts-create-index ./
[13:17:34] Target directories [ './' ]
[13:17:34] Update index: false
[13:17:34] ./index.ts [created index]
[13:17:34] Done

> tree
.
├── bar.ts
├── foo.ts
└── index.ts

0 directories, 3 files

This created index.ts with:

// @ts-create-index

export * from './bar';
export * from './foo';

Lets create a new file and re-run ts-create-index:

> touch baz.ts
> tree ./
./
├── bar.ts
├── baz.ts
├── foo.ts
└── index.ts

0 directories, 4 files

> ts-create-index ./
[13:21:55] Target directories [ './' ]
[13:21:55] Update index: false
[13:21:55] ./index.ts [updated index]
[13:21:55] Done

This have updated index.ts file:

// @ts-create-index

export * from './bar';
export * from './baz';
export * from './foo';

Usage

Using CLI Program

npm install ts-create-index

ts-create-index --help

Options:
  --recursive, -r          Create/update index files recursively. Halts on any
                           unsafe "index.ts" files.   [boolean] [default: false]
  --ignoreUnsafe, -i       Ignores unsafe "index.ts" files instead of halting.
                                                      [boolean] [default: false]
  --ignoreDirectories, -d  Ignores importing directories into the index file,
                           even if they have a safe "index.ts".
                                                      [boolean] [default: false]
  --update, -u             Updates only previously created index files
                           (recursively).             [boolean] [default: false]
  --banner                 Add a custom banner at the top of the index file
                                                                        [string]
  --extensions, -x         Allows some extensions to be parsed as valid source.
                           First extension will always be preferred to homonyms
                           with another allowed extension.
                                                       [array] [default: ["ts"]]
  --outputFile, -o         Output file            [string] [default: "index.ts"]                                                      [array] [default: ["ts"]]

Examples:
  ts-create-index ./src ./src/utilities      Creates or updates an existing
                                          ts-create-index index file in the target
                                          (./src, ./src/utilities) directories.
  ts-create-index --update ./src ./tests     Finds all ts-create-index index files in
                                          the target directories and descending
                                          directories. Updates found index
                                          files.
  ts-create-index ./src --extensions ts tsx  Creates or updates an existing
                                          ts-create-index index file in the target
                                          (./src) directory for both .ts and
                                          .tsx extensions.

Using ts-create-index Programmatically

import {writeIndex} from 'ts-create-index';

/**
 * @type {Function}
 * @param {Array<string>} directoryPaths
 * @throws {Error} Directory "..." does not exist.
 * @throws {Error} "..." is not a directory.
 * @throws {Error} "..." unsafe index.
 * @returns {boolean}
 */
writeIndex;

Note that the writeIndex function is synchronous.

import {findIndexFiles} from 'ts-create-index';

/**
 * @type {Function}
 * @param {string} directoryPath
 * @returns {Array<string>} List of directory paths that have ts-create-index index file.
 */
findIndexFiles;

Gulp

Since Gulp can ran arbitrary JavaScript code, there is no need for a separate plugin. See Using ts-create-index Programmatically.

import {writeIndex} from 'ts-create-index';

gulp.task('ts-create-index', () => {
  writeIndex(['./target_directory']);
});

Note that the writeIndex function is synchronous.

Implementation

ts-create-index program will look into the target directory.

If there is no ./index.ts, it will create a new file, e.g.

// @ts-create-index

Created index file must start with // @ts-create-index\n\n. This is used to make sure that ts-create-index does not accidentally overwrite your local files.

If there are sibling files, index file will import them and export, e.g.

children-directories-and-files git:(master) ✗ ls -lah
total 0
drwxr-xr-x   5 gajus  staff   170B  6 Jan 15:39 .
drwxr-xr-x  10 gajus  staff   340B  6 Jan 15:53 ..
drwxr-xr-x   2 gajus  staff    68B  6 Jan 15:29 bar
drwxr-xr-x   2 gajus  staff    68B  6 Jan 15:29 foo
-rw-r--r--   1 gajus  staff     0B  6 Jan 15:29 foo.ts

Given the above directory contents, ./index.ts will be:

// @ts-create-index

import * from './bar';
import * from './foo';

export {
    bar,
    foo
};

When file has the same name as a sibling directory, file import takes precedence.

Directories that do not have ./index.ts in themselves will be excluded.

When run again, ts-create-index will update existing ./index.ts if it starts with // @ts-create-index\n\n.

If ts-create-index is executed against a directory that contains ./index.ts, which does not start with // @ts-create-index\n\n, an error will be thrown.

Ignore files on --update

ts-create-index can ignore files in a directory if ./index.ts contains special object with defined ignore property which takes an array of regular expressions defined as strings, e.g.

> cat index.ts
// @ts-create-index {"ignore": ["/baz.ts$/"]}

> tree ./
./
├── bar.ts
├── baz.ts
├── foo.ts
└── index.ts

0 directories, 4 files

Given the above directory contents, after running ts-create-index with --update flag, ./index.ts will be:

// @ts-create-index {"ignore": ["/baz.ts$/"]}

import * from './bar';
import * from './foo';

export {
    bar,
    foo
};