History

George Kalpakas 8e5567d964 perf(ivy): ngcc - avoid unnecessary operations when we only need one format processed (#32003 )

Previously, when `ngcc` was called with `compileAllFormats === false`
(i.e. how `@angular/cli` calls it), it would not attempt to process
more properties, once the first was successfully processed. However, it
_would_ continue looping over them and perform some unnecessary
operations, such as:
- Determining the format each property maps to (which can be an
  expensive operation for some properties mapping to either UMD or
  CommonJS).
- Checking whether each property has been processed (which involves
  checking whether any property has been processed with a different
  version of `ngcc` each time).
- Potentially marking properties as processed (which involves a
  file-write operation).

This commit avoids the unnecessary operations by entirely skipping
subsequent properties, once the first one has been successfully
processed. While this theoretically improves performance, it is not
expected to have any noticeable impact in practice, since the list of
`propertiesToConsider` is typically small and the most expensive
operation (marking a property as processed) has low likelihood of
happening (plus these operations are a tiny fraction of `ngcc`'s work).

PR Close #32003

2019-08-05 12:54:17 -07:00

src

perf(ivy): ngcc - avoid unnecessary operations when we only need one format processed (#32003 )

2019-08-05 12:54:17 -07:00

test

perf(ivy): ngcc - avoid unnecessary file-write operations when marking properties as processed (#32003 )

2019-08-05 12:54:17 -07:00

BUILD.bazel

feat(ivy): ngcc - support ngcc "migrations" (#31544 )

2019-07-23 21:11:40 -07:00

index.ts

perf(ivy): ngcc - add a cache to the FileSystem (#30525 )

2019-07-09 09:40:46 -07:00

main-ngcc.ts

perf(ivy): ngcc - add a cache to the FileSystem (#30525 )

2019-07-09 09:40:46 -07:00

README.md

refactor(ivy): move ngcc into a higher level folder (#29092 )

2019-03-20 14:45:54 -04:00

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