How Changsets reads config.json internally

When you initialise Changesets via the CLI using init command, this command sets up the .changeset folder. It generates a readme and a config file. The config file includes the default options, as well as comments

on what these options represent.

The default config.json generated by init command looks like below:

{
 "commit": false,
 "updateInternalDependencies": "patch",
 "linked": [],
 "access": "restricted",
 "baseBranch": "master",
 "ignore": [],
 "changelog": "@changesets/cli/changelog"
}

Read more about config.json here.

Now that we understand what a config.json is for in using Changesets, let’s look at how CLI package reads this config.json.

In the run function, this try catch block is found:

try {
 config = await read(cwd, packages);
} catch (e) {
 let oldConfigExists = await fs.pathExists(
 path.resolve(cwd, ".changeset/config.js")
 );

read function is part of another package named config.

As you can see from the above image, fs.readJSON is used in combination with path.join that combines cwd .changesets “config.json”

parse accepts this config.json read as its first argument and this parse function is a really long function that performs additional operations using this json and packages (second argument).

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References:

1. https://github.com/changesets/changesets/blob/main/packages/cli/src/run.ts#L29

2. https://github.com/changesets/changesets/blob/main/packages/cli/src/run.ts#L44

3. https://github.com/changesets/changesets/blob/main/packages/config/src/index.ts#L94

4. https://github.com/changesets/changesets/blob/main/docs/config-file-options.md

5. https://github.com/changesets/changesets/blob/main/packages/cli/README.md

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