performance problem: --declaration and --outFile very slow #7221
Description
TypeScript Version: 1.8.2
I'm using --outFile, --module system and --declaration. It's very very slow (almost 15-20 seconds).
Diagnostics:
Files: 129
Lines: 49208
Nodes: 202105
Identifiers: 74553
Symbols: 3657523
Types: 16087
Memory used: 179859K
I/O read: 0.04s
I/O write: 0.07s
Parse time: 0.72s
Bind time: 0.40s
Check time: 1.89s
Emit time: 0.57s
Total time: 3.58s
total time shown in diagnostics is not real, it takes almost 15-20 seconds to complete
If I remove declaration generation times are close to 3.5s we find on diagnostics.
If I don't use --outFile, performance gets good again
I don't know if it's a good approach, but I'm trying to separate a big project into a smaller one, that's why I'm using this for development purposes
tsconfig.ts is:
{
"compilerOptions": {
"module": "system",
"jsx": "react",
"target": "es5",
"experimentalDecorators": true,
"emitDecoratorMetadata": true,
"noImplicitAny": true,
"rootDir": ".",
"noEmitOnError": true,
"allowSyntheticDefaultImports": true,
"sourceMap": true,
"outFile": "dist/albatross.js",
"declaration": true,
"noFallthroughCasesInSwitch": true,
"noImplicitReturns": true,
"forceConsistentCasingInFileNames": true
},
"exclude": [
"dist"
]
}