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Consume `index.d.ts` declaration file in source code

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I would like to reuse the type definitions within index.d.ts when porting plain .js files to .ts in my project. However I get Cannot find name 'Type'.

I feel like this is some configuration issue I'm banging my head against.Any help, much appreciated - thanks.

The folder structure looks like this

<root>  - /javascript (all js files)  index.d.ts    (declarations)

This is my current tsconfig.json

{"compilerOptions": {    /* Basic Options */"target": "es2017",                       /* 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": [ "es2017" ],                      /* 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": "react-native",                    /* 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. */    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */    // "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. */"skipLibCheck": true,                     /* Skip type checking of all declaration files (*.d.ts). */    /* Additional Checks */"forceConsistentCasingInFileNames": true,    // "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": "./javascript",                /* 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'. */"resolveJsonModule": true,    // "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. */  }}

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