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angular-docs-cn/packages/compiler-cli/ngcc
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Pete Bacon Darwin c65ac7fbad perf(ivy): ngcc - exit early if the targeted package has been compiled (#29740) 
Previously we always walked the whole folder tree looking for
entry-points before we tested whether a target package had been
processed already. This could take >10secs!

This commit does a quick check of the target package before doing
the full walk which brings down the execution time for ngcc in this
case dramatically.

```
$ time ./node_modules/.bin/ivy-ngcc -t @angular/common/http/testing
Compiling @angular/core : fesm2015 as esm2015
Compiling @angular/core : fesm5 as esm5
Compiling @angular/core : esm2015 as esm2015
Compiling @angular/core : esm5 as esm5
Compiling @angular/common/http : fesm2015 as esm2015
Compiling @angular/common/http : fesm5 as esm5
Compiling @angular/common/http : esm2015 as esm2015
Compiling @angular/common/http : esm5 as esm5
Compiling @angular/common/http/testing : fesm2015 as esm2015
Compiling @angular/common/http/testing : fesm5 as esm5
Compiling @angular/common/http/testing : esm2015 as esm2015
Compiling @angular/common/http/testing : esm5 as esm5

real	0m19.766s
user	0m28.533s
sys	0m2.262s
```

```
$ time ./node_modules/.bin/ivy-ngcc -t @angular/common/http/testing
The target entry-point has already been processed

real	0m0.666s
user	0m0.605s
sys	0m0.113s
```

PR Close #29740
 		2019-04-08 09:48:20 -07:00
..
src perf(ivy): ngcc - exit early if the targeted package has been compiled (#29740) 2019-04-08 09:48:20 -07:00
test perf(ivy): ngcc - exit early if the targeted package has been compiled (#29740) 2019-04-08 09:48:20 -07:00
BUILD.bazel feat(ivy): performance trace mechanism for ngtsc (#29380) 2019-04-01 15:13:55 -07:00
README.md refactor(ivy): move ngcc into a higher level folder (#29092) 2019-03-20 14:45:54 -04:00
index.ts feat(compiler-cli): ngcc - make logging more configurable (#29591) 2019-04-01 11:53:28 -07:00
main-ngcc.ts fix(ivy): ngcc - show logging via CLI by default (#29686) 2019-04-03 15:27:39 -07:00

README.md

Angular Compatibility Compiler (ngcc)

This compiler will convert node_modules compiled with ngc, into node_modules which appear to have been compiled with ngtsc.

This conversion will allow such "legacy" packages to be used by the Ivy rendering engine.

Building

The project is built using Bazel:

yarn bazel build //packages/compiler-cli/ngcc

Unit Testing

The unit tests are built and run using Bazel:

yarn bazel test //packages/compiler-cli/ngcc/test

Integration Testing

There are tests that check the behavior of the overall executable:

yarn bazel test //packages/compiler-cli/ngcc/test:integration