[Draft] Breaking changes in Rspack v0.7.0

[LingyuCoder]

This thread is used to collect planned breaking changes for Rspack v0.7.0.

[ahabhgk]

remove resolve.browserField:

rspack/packages/rspack/src/config/zod.ts

Lines 385 to 399 in 5f65349

	/**
	* This is `aliasField: ["browser"]` in webpack, because no one
	* uses aliasField other than "browser". ---@bvanjoi
	*/
	browserField: z
	.boolean()
	.optional()
	.refine(val => {
	if (val !== undefined) {
	deprecatedWarn(
	`'resolve.browserField' has been deprecated, and will be removed in 0.6.0. Please use 'resolve.aliasField' instead.`
	);
	}
	return true;
	}),

[h-a-n-a]

remove experiments.newSplitChunks:

rspack/packages/rspack/src/config/zod.ts

Lines 1198 to 1211 in 5f65349

	newSplitChunks: z
	.boolean()
	.optional()
	.refine(val => {
	if (val === false) {
	deprecatedWarn(
	`'experiments.newSplitChunks = ${JSON.stringify(
	val
	)}' has been deprecated, please switch to 'experiments.newSplitChunks = true' to use webpack's behavior.
	See the discussion here (https://github.com/web-infra-dev/rspack/discussions/4168)`
	);
	}
	return true;
	}),

[ahabhgk]

remove builtins.treeShaking (oldTreeShaking) and builtins

[hardfist]

switch experiments.css to false by default @JSerFeng

[JSerFeng]

Postponed to 0.8

[hardfist]

enable concatmodulePlugin by default in production @JSerFeng

[JSerFeng]

Cancelled

[chenjiahan]

I prefer this to be a fix or improvement rather than a breaking change 😄

[h-a-n-a]

Bump swc_core to the latest minor (0.91.x), which includes a breaking change to ast, thus to SWC wasm plugin.

[h-a-n-a]

Note: This is not necessarily to be released in the next version. Listing here for a heads-up.

[ahabhgk]

Remove exportsConvention for module type css, it's an mistake that introduce it for module type css

[LingyuCoder]

Remove builtin define plugin in rspack-cli #6219, relate to #6214

[h-a-n-a]

Deprecating and stabilizing JavaScript APIs in #6448.
API-wise detail will be added once finished.

[h-a-n-a]

• Compiler/MultiCompiler: feat: deprecate Compiler and MultiCompiler API #6448

[h-a-n-a]

• Compilation: feat: deprecate Compilation API #6505

[JSerFeng]

Remove old treeshaking