I am targeting ES2018 and do not care about ES3 or ES5. From my tsconfig.json: target: ES2018. tsc complains:

An async function or method in ES5/ES3 requires the 'Promise' constructor. Make
sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your --lib option.

I know I could add lib: [es2015] to add libraries to the compilation but I don't need those libraries, I am targeting ES2018.

How do I target ES2018 in TypeScript?

Here is my tsconfig.json:

{

    compilerOptions: {

            /* Basic Options */

            target: ES2018 /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,

            module: commonjs /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,

            lib: [es2015] /* Specify library files to be included in the compilation. */,

            // allowJs: true,                       /* Allow javascript files to be compiled. */

            // checkJs: true,                       /* Report errors in .js files. */

            // jsx: preserve,                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */

            // declaration: true,                   /* Generates corresponding '.d.ts' file. */

            // declarationMap: true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */

            // sourceMap: true,                     /* Generates corresponding '.map' file. */

            // outFile: ./,                       /* Concatenate and emit output to single file. */

            // outDir: ./,                        /* Redirect output structure to the directory. */

            // rootDir: ./,                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */

            // composite: true,                     /* Enable project compilation */

            // removeComments: true,                /* Do not emit comments to output. */

            // noEmit: true,                        /* Do not emit outputs. */

            // importHelpers: true,                 /* Import emit helpers from 'tslib'. */

            // downlevelIteration: true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */

            // isolatedModules: true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */



            /* Strict Type-Checking Options */

            strict: true /* Enable all strict type-checking options. */,

            // noImplicitAny: true,                 /* Raise error on expressions and declarations with an implied 'any' type. */

            // strictNullChecks: true,              /* Enable strict null checks. */

            // strictFunctionTypes: true,           /* Enable strict checking of function types. */

            // strictPropertyInitialization: true,  /* Enable strict checking of property initialization in classes. */

            // noImplicitThis: true,                /* Raise error on 'this' expressions with an implied 'any' type. */

            // alwaysStrict: true,                  /* Parse in strict mode and emit use strict for each source file. */



            /* Additional Checks */

            // noUnusedLocals: true,                /* Report errors on unused locals. */

            // noUnusedParameters: true,            /* Report errors on unused parameters. */

            // noImplicitReturns: true,             /* Report error when not all code paths in function return a value. */

            // noFallthroughCasesInSwitch: true,    /* Report errors for fallthrough cases in switch statement. */



            /* Module Resolution Options */

            // moduleResolution: node,            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */

            // baseUrl: ./,                       /* Base directory to resolve non-absolute module names. */

            // paths: {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */

            // rootDirs: [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */

            // typeRoots: [],                       /* List of folders to include type definitions from. */

            // types: [],                           /* Type declaration files to be included in compilation. */

            // allowSyntheticDefaultImports: true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */

            esModuleInterop: true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */

            // preserveSymlinks: true,              /* Do not resolve the real path of symlinks. */



            /* Source Map Options */

            // sourceRoot: ,                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */

            // mapRoot: ,                         /* Specify the location where debugger should locate map files instead of generated locations. */

            // inlineSourceMap: true,               /* Emit a single file with source maps instead of having a separate file. */

            // inlineSources: true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */



            /* Experimental Options */

            // experimentalDecorators: true,        /* Enables experimental support for ES7 decorators. */

            // emitDecoratorMetadata: true,         /* Enables experimental support for emitting type metadata for decorators. */

    }

}