ng serve OOM POC

Environments

• Ubuntu 18.04.4 LTS x86_64
• Node v12.18.2

Preconditions

• It uses @angular/localize.
• It is configured to use ES5.
• It loads large object.
  • In this repository, encoding-japanese library has large objects to convert encoding.
• It is configured to generate sourcemaps (Default)

Result

with localize and ES5 and sourcemap: ng serve consumes 7.1GB of memory

$ npm ci && /usr/bin/time -f '%M' node --max_old_space_size=8192 ./node_modules/@angular/cli/bin/ng serve
(skipped)
7113592

without sourcemap: ng serve consumes 0.8GB of memory

$ npm ci && /usr/bin/time -f '%M' node --max_old_space_size=8192 ./node_modules/@angular/cli/bin/ng serve --no-source-map
(skipped)
848624

without localize: ng serve consumes 0.8GB of memory

$ npm ci && /usr/bin/time -f '%M' node --max_old_space_size=8192 ./node_modules/@angular/cli/bin/ng serve -c disable-localize
(skipped)
813356

build target is ES2015: ng serve consumes 0.8GB of memory

$ npm ci && /usr/bin/time -f '%M' node --max_old_space_size=8192 ./node_modules/@angular/cli/bin/ng serve -c es2015
(skipped)
860044