fix(tsc): improve regexp performance for global type removal #4260
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The issue with the removal of global types was the RegExp, for certain files written like `.tsbuildinfo` which is a single line long contents file it would scan the whole line scanning for the characters. By specifying `m` flag it causes ^ and $ to match the begin/end of each line (not only begin/end of string). This removes the need for the check of the filename to do the replacement check.
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Apr 12, 2024
| @@ -65,7 +58,7 @@ export function run() { | |||
| } | |||
| } | |||
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| const removeEmitGlobalTypesRegexp = /[^\n]*__VLS_globalTypesStart[\w\W]*__VLS_globalTypesEnd[^\n]*\n/g; | |||
| const removeEmitGlobalTypesRegexp = /^[^\n]*__VLS_globalTypesStart[\w\W]*__VLS_globalTypesEnd[^\n]*\n?$/mg; | |||
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I think those initial/trailing \n make no sense with m flag. Those should be ignored anyway when matching with m flag.
Suggested change
| const removeEmitGlobalTypesRegexp = /^[^\n]*__VLS_globalTypesStart[\w\W]*__VLS_globalTypesEnd[^\n]*\n?$/mg; | |
| const removeEmitGlobalTypesRegexp = /^.*__VLS_globalTypesStart[\w\W]*__VLS_globalTypesEnd.*$/mg; |
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The issue with the removal of global types was the RegExp, for certain files written like
.tsbuildinfowhich is a single line long contents file it would scan the whole line scanning for the characters.By specifying
mflag it causes^and$to match the begin/end of each line (not only begin/end of string).This removes the need for the check of the filename to do the replacement check.