feat: add hires mode source map mode using range mappings - #317
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Adds an "experimental-range" option for the hires mode that provides a similar resolution as "true" but uses range mappings to reduce the number of mappings. Requires support for range mappings proposal in source map consumers: https://github.com/tc39/ecma426/blob/main/proposals/range-mappings.md Co-authored-by: Asumu Takikawa <asumu@igalia.com>
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This proposal is also being implemented in Babel (we plan to ship it in the next minor release), at babel/babel#18006 |
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I would love to ship this as |
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Note: This is a continuation of work for PR #306, where @takikawa is the original author
This is a PR for adding an "experimental-range" option for the source map output's hires mode (experimental because the flag relies on a non-finalized source map feature). This new option provides a similar resolution as providing hires: true, but uses range mappings to reduce the number of mappings.
Range mappings is an in-progress proposal for source maps that we're working on in the source map specification group (TC39-TG4). It would allow mappings to be specified for a whole range of continuous positions at once.
One important note is that it depends on
jridgewell/sourcemap-codec 1.6.0-beta.0due to range mapping support. Let me know if it's a problem.