Pete Bacon Darwin bd7f440357 perf(ngcc): shortcircuit tokenizing in ESM dependency host (#37639)
This dependency host tokenizes files to identify all the imported
paths. This commit calculates the last place in the source code
where there can be an import path; it then exits the tokenization
when we get to this point in the file.

Testing with a reasonably large project showed that the tokenizer
spends about 2/3 as much time scanning files. For example in a
"noop" hot run of ngcc using the program-based entry-point
finder the percentage of time spent in the `scan()` function of
the TS tokenizer goes down from 9.9% to 6.6%.

PR Close #37639
2020-06-18 16:05:42 -07:00
2020-01-27 09:31:22 -08:00
2020-01-13 07:21:43 -08:00

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