--- title: "postcss Breaking Changes on npm | Since.dev" description: "What each postcss release removed, renamed or changed: 169 breaking changes in 14 versions on npm, each with its source." canonical_url: https://since.dev/packages/npm/postcss last_updated: 2026-07-24 --- # postcss breaking changes Every breaking API change we have recorded in postcss on npm: 169 breaking changes in 14 versions. Below are its newest 6 versions, removals and renames first, each with its source. Newest change July 24, 2026 ## 8.5.23 1 breaking change, first published July 24, 2026. - **Behavior changed** `opts.from` PostCSS no longer loads source maps unless opts.from is passed. Set opts.from to keep source map loading working. [github.com](https://github.com/postcss/postcss/releases/tag/8.5.23) ## 8.5.18 2 breaking changes, first published July 12, 2026. - **Behavior changed** Loading a previous source maps file is restricted to the opts.from folder for security. Code that loads maps from elsewhere must set unsafeMap: true to keep working. [github.com](https://github.com/postcss/postcss/releases/tag/8.5.18) - **Signature changed** `Parser.__call` Was (css: {toString(): string} | string, opts?: Pick): RootNode; now (css: {toString(): string} | string, opts?: Pick): RootNode. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.18) ## 8.5.9 6 breaking changes, first published April 7, 2026. - **Signature changed** `lib/container:ContainerWithChildren` Was type ContainerWithChildren = {nodes: Child\[\]} & (| AtRule | Root | Rule); now type ContainerWithChildren = {nodes: Child\[\]} & (AtRule | Root | Rule). [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.9) - **Signature changed** `lib/fromJSON:default` Was const fromJSON: FromJSON; now let fromJSON: FromJSON. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.9) - **Signature changed** `lib/list:default` Was const list: list.List; now let list: list.List. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.9) - **Signature changed** `lib/parse:default` Was const parse: Parse; now let parse: Parse. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.9) - **Signature changed** `lib/stringify:default` Was const stringify: Stringify; now let stringify: Stringify. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.9) - **Signature changed** `list` Was const list: list.List; now let list: list.List. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.9) ## 8.5.6 48 breaking changes, first published June 16, 2025. - **Removed** `lib/container:ContainerWithChildren.after` ContainerWithChildren.after was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.append` ContainerWithChildren.append was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.assign` ContainerWithChildren.assign was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.before` ContainerWithChildren.before was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.cleanRaws` ContainerWithChildren.cleanRaws was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.clone` ContainerWithChildren.clone was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.cloneAfter` ContainerWithChildren.cloneAfter was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.cloneBefore` ContainerWithChildren.cloneBefore was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.each` ContainerWithChildren.each was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) - **Removed** `lib/container:ContainerWithChildren.error` ContainerWithChildren.error was removed in postcss 8.5.6 [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.6) And 38 more in this version. ## 8.5.4 4 breaking changes, first published May 29, 2025. - **Signature changed** `lib/container:ContainerWithChildren.rangeBy` Was rangeBy(opts?: Pick): Node.Range; now rangeBy(opts?: Pick): Node.Range. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.4) - **Signature changed** `lib/stringifier:default.raw` Was raw(node: AnyNode, own: null | string, detect?: string): string; now raw(node: AnyNode, own: null | string, detect?: string): boolean | string. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.4) - **Signature changed** `lib/stringifier:default.rawValue` Was rawValue(node: AnyNode, prop: string): string; now rawValue(node: AnyNode, prop: string): number | string. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.4) - **Signature changed** `Node.rangeBy` Was rangeBy(opts?: Pick): Node.Range; now rangeBy(opts?: Pick): Node.Range. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.4) ## 8.5.3 3 breaking changes, first published February 19, 2025. - **Signature changed** `AtRule.nodes` Was nodes: Container\['nodes'\]; now nodes: Container\['nodes'\] | undefined. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.3) - **Signature changed** `lib/at-rule:default.nodes` Was nodes: Container\['nodes'\]; now nodes: Container\['nodes'\] | undefined. [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.3) - **Signature changed** `plugin` Was export {default, stringify, fromJSON, plugin, parse, list, document, comment, atRule, rule, decl, root, CssSyntaxError, Declaration, Container, Processor, Document, Comment, Warning, AtRule, Result, Input, Rule, Root, Node... [npmjs.com](https://www.npmjs.com/package/postcss/v/8.5.3) ## Check your code These are the changes. To see which of them reach your code, [scan a public repository](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#api) reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys. ## Put your code on continuous management. Scan a public repository now, or give your agent one line. ### See how out of date your code is. [Scan a repository](https://since.dev/scan.md). Any public GitHub repository. No sign-in. ### Tell your agent what changed since it was trained. `claude mcp add --transport http since https://api.since.dev/mcp` --- Every page on this site as Markdown: https://since.dev/sitemap.md. For agents: https://since.dev/llms.txt.