Deno.CompilerOptions
UNSTABLE: new API, yet to be vetted.
A specific subset TypeScript compiler options that can be supported by the Deno TypeScript compiler.
§Properties
Allow default imports from modules with no default export. This does not
affect code emit, just typechecking. Defaults to false.
Parse in strict mode and emit "use strict" for each source file.
Defaults to true.
Report errors in .js files. Use in conjunction with allowJs. Defaults
to false.
Generates a source map for each corresponding .d.ts file. Defaults to
false.
Provide full support for iterables in for..of, spread and
destructuring when targeting ES5 or ES3. Defaults to false.
Emit design-type metadata for decorated declarations in source. See issue
microsoft/TypeScript#2577
for details. Defaults to false.
Emit __importStar and __importDefault helpers for runtime babel
ecosystem compatibility and enable allowSyntheticDefaultImports for type
system compatibility. Defaults to true.
Enables experimental support for ES decorators. Defaults to true.
This flag controls how import works, there are 3 different options:
remove: The default behavior of dropping import statements which only reference types.preserve: Preserves allimportstatements whose values or types are never used. This can cause imports/side-effects to be preserved.error: This preserves all imports (the same as the preserve option), but will error when a value import is only used as a type. This might be useful if you want to ensure no values are being accidentally imported, but still make side-effect imports explicit.
This flag works because you can use import type to explicitly create an
import statement which should never be emitted into JavaScript.
Emit a single file with source maps instead of having a separate file.
Defaults to false.
Emit the source alongside the source maps within a single file; requires
inlineSourceMap or sourceMap to be set. Defaults to false.
Support JSX in .tsx files: "react", "preserve", "react-native",
"react-jsx", "react-jsxdev". Defaults to "react"`.
Specify the JSX factory function to use when targeting react JSX emit,
e.g. React.createElement or h. Defaults to React.createElement.
Specify the JSX fragment factory function to use when targeting react
JSX emit, e.g. Fragment. Defaults to React.Fragment.
Declares the module specifier to be used for importing the jsx and
jsxs factory functions when using jsx as "react-jsx" or
"react-jsxdev". Defaults to "react".
Resolve keyof to string valued property names only (no numbers or
symbols). Defaults to false.
List of library files to be included in the compilation. If omitted, then the Deno main runtime libs are used.
Specifies the location where debugger should locate map files instead of
generated locations. Use this flag if the .map files will be located at
run-time in a different location than the .js files. The location
specified will be embedded in the source map to direct the debugger where
the map files will be located. Defaults to undefined.
Specify the module format for the emitted code. Defaults to
"esnext".
Do not generate custom helper functions like __extends in compiled
output. Defaults to false.
Report errors for fallthrough cases in switch statement. Defaults to
false.
Raise error on expressions and declarations with an implied any type.
Defaults to true.
Report an error when not all code paths in function return a value.
Defaults to false.
Raise error on this expressions with an implied any type. Defaults to
true.
Do not emit "use strict" directives in module output. Defaults to
false.
Do not add triple-slash references or module import targets to the list of
compiled files. Defaults to false.
Disable strict checking of generic signatures in function types. Defaults
to false.
Include 'undefined' in index signature results. Defaults to false.
List of path mapping entries for module names to locations relative to the
baseUrl. Defaults to undefined.
Do not erase const enum declarations in generated code. Defaults to
false.
Remove all comments except copy-right header comments beginning with
/*!. Defaults to true.
Specifies the root directory of input files. Only use to control the
output directory structure with outDir. Defaults to undefined.
List of root folders whose combined content represent the structure of
the project at runtime. Defaults to undefined.
Specifies the location where debugger should locate TypeScript files
instead of source locations. Use this flag if the sources will be located
at run-time in a different location than that at design-time. The location
specified will be embedded in the sourceMap to direct the debugger where
the source files will be located. Defaults to undefined.
Enable all strict type checking options. Enabling strict enables
noImplicitAny, noImplicitThis, alwaysStrict, strictBindCallApply,
strictNullChecks, strictFunctionTypes and
strictPropertyInitialization. Defaults to true.
Enable stricter checking of the bind, call, and apply methods on
functions. Defaults to true.
Disable bivariant parameter checking for function types. Defaults to
true.
In strict null checking mode, the null and undefined values are not in
the domain of every type and are only assignable to themselves and any
(the one exception being that undefined is also assignable to void).
Ensure non-undefined class properties are initialized in the constructor.
This option requires strictNullChecks be enabled in order to take effect.
Defaults to true.
Suppress excess property checks for object literals. Defaults to
false.
Suppress noImplicitAny errors for indexing objects lacking index
signatures.
Specify ECMAScript target version. Defaults to esnext.
List of names of type definitions to include when type checking.
Defaults to undefined.
The type definitions are resolved according to the normal Deno resolution
irrespective of if sources are provided on the call. In addition, unlike
passing the --config option on startup, there is no base to resolve
relative specifiers, so the specifiers here have to be fully qualified
URLs or paths. For example:
Deno.emit("./a.ts", {
compilerOptions: {
types: [
"https://deno.land/x/pkg/types.d.ts",
"/Users/me/pkg/types.d.ts",
]
}
});