svelte

History

Nic Polumeyv 504a7536c6 perf: stop scanning the whole template for every expression (#18738 ) Parsing a 90 KB component drops from 460 ms to 35 ms; typical components parse ~30% faster. `read_pattern` blanked out the entire template before the pattern with `replace(/[^\n]/g, ' ')` to keep positions aligned, and `acorn.parseExpressionAt` re-counted lines from the top of the file on every call. Acorn never looks before `pos`, so the real template can be the prefix, and acorn 8.18's `startLocation` takes the line we already have from the locator. The blanking also had `loc.column` off by one for every node inside a destructured pattern (noted in #18087), hence the snapshot updates.	1 month ago
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samples	perf: stop scanning the whole template for every expression (#18738 )	1 month ago
test.ts	fix: preserve node locations for better sourcemaps (#17269 )	11 months ago

perf: stop scanning the whole template for every expression (#18738 )

Parsing a 90 KB component drops from 460 ms to 35 ms; typical components
parse ~30% faster.

`read_pattern` blanked out the entire template before the pattern with
`replace(/[^\n]/g, ' ')` to keep positions aligned, and
`acorn.parseExpressionAt` re-counted lines from the top of the file on
every call. Acorn never looks before `pos`, so the real template can be
the prefix, and acorn 8.18's `startLocation` takes the line we already
have from the locator.

The blanking also had `loc.column` off by one for every node inside a
destructured pattern (noted in #18087), hence the snapshot updates.

samples

perf: stop scanning the whole template for every expression (#18738 )

test.ts

fix: preserve node locations for better sourcemaps (#17269 )