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node_modules/graphql/utilities/coerceInputValue.js.flow

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+// @flow strict
+
+import { forEach, isCollection } from 'iterall';
+
+import objectValues from '../polyfills/objectValues';
+
+import inspect from '../jsutils/inspect';
+import invariant from '../jsutils/invariant';
+import didYouMean from '../jsutils/didYouMean';
+import isObjectLike from '../jsutils/isObjectLike';
+import suggestionList from '../jsutils/suggestionList';
+import printPathArray from '../jsutils/printPathArray';
+import { type Path, addPath, pathToArray } from '../jsutils/Path';
+
+import { GraphQLError } from '../error/GraphQLError';
+import {
+  type GraphQLInputType,
+  isScalarType,
+  isEnumType,
+  isInputObjectType,
+  isListType,
+  isNonNullType,
+} from '../type/definition';
+
+type OnErrorCB = (
+  path: $ReadOnlyArray<string | number>,
+  invalidValue: mixed,
+  error: GraphQLError,
+) => void;
+
+/**
+ * Coerces a JavaScript value given a GraphQL Input Type.
+ */
+export function coerceInputValue(
+  inputValue: mixed,
+  type: GraphQLInputType,
+  onError?: OnErrorCB = defaultOnError,
+): mixed {
+  return coerceInputValueImpl(inputValue, type, onError);
+}
+
+function defaultOnError(
+  path: $ReadOnlyArray<string | number>,
+  invalidValue: mixed,
+  error: GraphQLError,
+) {
+  let errorPrefix = 'Invalid value ' + inspect(invalidValue);
+  if (path.length > 0) {
+    errorPrefix += ` at "value${printPathArray(path)}": `;
+  }
+  error.message = errorPrefix + ': ' + error.message;
+  throw error;
+}
+
+function coerceInputValueImpl(
+  inputValue: mixed,
+  type: GraphQLInputType,
+  onError: OnErrorCB,
+  path: Path | void,
+): mixed {
+  if (isNonNullType(type)) {
+    if (inputValue != null) {
+      return coerceInputValueImpl(inputValue, type.ofType, onError, path);
+    }
+    onError(
+      pathToArray(path),
+      inputValue,
+      new GraphQLError(
+        `Expected non-nullable type ${inspect(type)} not to be null.`,
+      ),
+    );
+    return;
+  }
+
+  if (inputValue == null) {
+    // Explicitly return the value null.
+    return null;
+  }
+
+  if (isListType(type)) {
+    const itemType = type.ofType;
+    if (isCollection(inputValue)) {
+      const coercedValue = [];
+      forEach((inputValue: any), (itemValue, index) => {
+        coercedValue.push(
+          coerceInputValueImpl(
+            itemValue,
+            itemType,
+            onError,
+            addPath(path, index),
+          ),
+        );
+      });
+      return coercedValue;
+    }
+    // Lists accept a non-list value as a list of one.
+    return [coerceInputValueImpl(inputValue, itemType, onError, path)];
+  }
+
+  if (isInputObjectType(type)) {
+    if (!isObjectLike(inputValue)) {
+      onError(
+        pathToArray(path),
+        inputValue,
+        new GraphQLError(`Expected type ${type.name} to be an object.`),
+      );
+      return;
+    }
+
+    const coercedValue = {};
+    const fieldDefs = type.getFields();
+
+    for (const field of objectValues(fieldDefs)) {
+      const fieldValue = inputValue[field.name];
+
+      if (fieldValue === undefined) {
+        if (field.defaultValue !== undefined) {
+          coercedValue[field.name] = field.defaultValue;
+        } else if (isNonNullType(field.type)) {
+          const typeStr = inspect(field.type);
+          onError(
+            pathToArray(path),
+            inputValue,
+            new GraphQLError(
+              `Field ${field.name} of required type ${typeStr} was not provided.`,
+            ),
+          );
+        }
+        continue;
+      }
+
+      coercedValue[field.name] = coerceInputValueImpl(
+        fieldValue,
+        field.type,
+        onError,
+        addPath(path, field.name),
+      );
+    }
+
+    // Ensure every provided field is defined.
+    for (const fieldName of Object.keys(inputValue)) {
+      if (!fieldDefs[fieldName]) {
+        const suggestions = suggestionList(
+          fieldName,
+          Object.keys(type.getFields()),
+        );
+        onError(
+          pathToArray(path),
+          inputValue,
+          new GraphQLError(
+            `Field "${fieldName}" is not defined by type ${type.name}.` +
+              didYouMean(suggestions),
+          ),
+        );
+      }
+    }
+    return coercedValue;
+  }
+
+  if (isScalarType(type)) {
+    let parseResult;
+
+    // Scalars determine if a input value is valid via parseValue(), which can
+    // throw to indicate failure. If it throws, maintain a reference to
+    // the original error.
+    try {
+      parseResult = type.parseValue(inputValue);
+    } catch (error) {
+      onError(
+        pathToArray(path),
+        inputValue,
+        new GraphQLError(
+          `Expected type ${type.name}. ` + error.message,
+          undefined,
+          undefined,
+          undefined,
+          undefined,
+          error,
+        ),
+      );
+      return;
+    }
+    if (parseResult === undefined) {
+      onError(
+        pathToArray(path),
+        inputValue,
+        new GraphQLError(`Expected type ${type.name}.`),
+      );
+    }
+    return parseResult;
+  }
+
+  if (isEnumType(type)) {
+    if (typeof inputValue === 'string') {
+      const enumValue = type.getValue(inputValue);
+      if (enumValue) {
+        return enumValue.value;
+      }
+    }
+    const suggestions = suggestionList(
+      String(inputValue),
+      type.getValues().map(enumValue => enumValue.name),
+    );
+    onError(
+      pathToArray(path),
+      inputValue,
+      new GraphQLError(`Expected type ${type.name}.` + didYouMean(suggestions)),
+    );
+    return;
+  }
+
+  // Not reachable. All possible input types have been considered.
+  invariant(false, 'Unexpected input type: ' + inspect((type: empty)));
+}