Type 'undefined' cannot be used as an index type. #38
Description
I'm getting 8 errors when loading this package:
node_modules/graphql-fields-list/index.ts:292:27 - error TS2538: Type 'undefined' cannot be used as an index type.
292 if (!propTree[prop]) {
~~~~
node_modules/graphql-fields-list/index.ts:293:26 - error TS2538: Type 'undefined' cannot be used as an index type.
293 propTree[prop] = i === s - 1 || all ? true : {};
~~~~
node_modules/graphql-fields-list/index.ts:297:33 - error TS2538: Type 'undefined' cannot be used as an index type.
297 propTree = propTree[prop] as SkipTree;
~~~~
node_modules/graphql-fields-list/index.ts:316:9 - error TS2322: Type 'SkipValue | undefined' is not assignable to type 'SkipValue'.
Type 'undefined' is not assignable to type 'SkipValue'.
316 return (skip as SkipTree)[node];
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
node_modules/graphql-fields-list/index.ts:327:13 - error TS2322: Type 'SkipValue | undefined' is not assignable to type 'SkipValue'.
327 nodeTree = (skip as SkipTree)[pattern];
~~~~~~~~
node_modules/graphql-fields-list/index.ts:371:31 - error TS2345: Argument of type 'FragmentDefinitionNode | undefined' is not assignable to parameter of type 'FragmentDefinitionNode | SelectionNode'.
Type 'undefined' is not assignable to type 'FragmentDefinitionNode | SelectionNode'.
371 traverse(getNodes(opts.fragments[name]), root, opts, skip);
~~~~~~~~~~~~~~~~~~~~
node_modules/graphql-fields-list/index.ts:386:17 - error TS2345: Argument of type 'MapResultKey | undefined' is not assignable to parameter of type 'MapResultKey'.
Type 'undefined' is not assignable to type 'MapResultKey'.
386 (root as MapResult)[name],
~~~~~~~~~~~~~~~~~~~~~~~~~
node_modules/graphql-fields-list/index.ts:587:17 - error TS2322: Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.
587 dotName = transform[dotName];
This package seemed promising, but I'm not sure how I can use it if I can't import it without these errors.
Might be relevant to show my config:
{
"$schema": "https://json.schemastore.org/tsconfig", // For code completion and type checking inside this file.
"include": ["src/**/*", "test/**/*"],
"exclude": ["node_modules", "dist"],
"compilerOptions": {
"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": ["DOM", "DOM.Iterable", "ESNext"], // Specify library files to be included in the compilation.
"outDir": "./dist", // Redirect output structure to the directory.
"strict": true, // Enable all strict type-checking options.
"useUnknownInCatchVariables": true, // Type catch variables as 'unknown' by default.
"alwaysStrict": true, // Parse in strict mode and emit "use strict" for each source file.
"exactOptionalPropertyTypes": false, // Disallow assigning 'undefined' to optional properties.
"noUncheckedIndexedAccess": true, // Add 'undefined' to the type of index signatures.
"useDefineForClassFields": false,
"experimentalDecorators": true, // Enables experimental support for ES7 decorators.
"forceConsistentCasingInFileNames": true, // Disallow inconsistently-cased references to the same file.
"noUnusedLocals": true, // Report errors on unused locals.
"noUnusedParameters": true, // Report errors on unused parameters.
"noImplicitOverride": true, // Force explicit 'override' keyword.
"noImplicitReturns": true, // Report error when not all code paths in function return a value.
"noFallthroughCasesInSwitch": true, // Report errors for fallthrough cases in switch statement.
"noPropertyAccessFromIndexSignature": true, // Force consistency in dot operator versus indexing.
"moduleResolution": "node", // Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6).
"baseUrl": "./", // Base directory to resolve non-absolute module names.
"types": ["validator", "jest", "node"], // Type declaration files to be included in compilation.
"esModuleInterop": true, // Emit '__importStar' and '__importDefault' helpers for runtime babel ecosystem compatibility and enable '--allowSyntheticDefaultImports' for typesystem compatibility.
"resolveJsonModule": true, // Include modules imported with '.json' extension.
"incremental": true, // Enable incremental compilation by reading/writing information from prior compilations to a file on disk.
"emitDecoratorMetadata": true, // Enables experimental support for emitting type metadata for decorators.
"sourceMap": true // Generates corresponding '.map' file.
},
}