Angular-cli 'JavaScript heap out of memory' on asset optimization

Add the below line to package.json file.

"aot": "node --max-old-space-size=8192 ./node_modules/@angular/cli/bin/ng build --prod --aot"

and try running with npm run aot

It worked for me.

For those who get the same error, I solved the problem by changing global ng.cmd file.

C:\Users\userName\%AppData%\Roaming\npm

Copy/paste the following code into your ng.cmd.

@IF EXIST "%~dp0\node.exe" (
  "%~dp0\node.exe" --max_old_space_size=8048 "%~dp0\node_modules\@angular\cli\bin\ng" %*
) ELSE (
  @SETLOCAL
  @SET PATHEXT=%PATHEXT:;.JS;=;%
  node --max_old_space_size=8048 "%~dp0\node_modules\@angular\cli\bin\ng" %*
)

You can add NODE_OPTIONS as a system variable. To set memory to 4 gigs,

--max-old-space-size=4096

Lots more info on this thread, they deserve the votes