tsconfig.base.json
{
"compilerOptions": {
"outDir": "dist/esm",
"module": "es2015",
"target": "es5",
"lib": ["es2017", "es2016", "dom"],
"sourceMap": true,
"moduleResolution": "node",
"noImplicitReturns": true,
"noImplicitThis": true,
"noImplicitAny": true,
"strictNullChecks": true,
"declaration": true,
"esModuleInterop": true,
"experimentalDecorators": true
}
}