handlebars breaking changes
Every breaking API change we have recorded in handlebars on npm: 5 breaking changes in 1 version. Below are its newest version, removals and renames first, each with its source.
Newest change October 5, 2026
On this page
4.7.10
- Behavior changed
Special properties on context data are no longer trusted, so templates depending on them may behave differently. github.com - Behavior changed
Partials are compiled only when they are template strings, so other partial values are no longer compiled. github.com - Behavior changed
Precompiled template output escapes `<!--` and `<script` sequences, so precompiled output differs from earlier versions. github.com - Behavior changed
Validation of AST values moved from the parser to the compiler, so invalid input may be reported at a different stage. github.com - Behavior changed
each
The #each block now iterates Map, Set and generators lazily like for...of instead of copying them into an array first. Values added while the block renders are also visited, so templates relying on the old snapshot may render differently. github.com
Check your code
These are the changes. To see which of them reach your code, scan a public repository, or have your coding agent call check_code with your manifest or lockfile over MCP. The 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.
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claude mcp add --transport http since https://api.since.dev/mcp