@graphql-mesh/transform-prefix/index.mjs

import { RenameTypes, RenameRootFields } from '@graphql-tools/wrap';
import { applySchemaTransforms, applyRequestTransforms, applyResultTransforms } from '@graphql-mesh/utils';
import { resolvers } from 'graphql-scalars';
import { isSpecifiedScalarType } from 'graphql';
import { mapSchema, MapperKind, renameType } from '@graphql-tools/utils';

class WrapPrefix {
    constructor(options) {
        this.transforms = [];
        const { apiName, config } = options;
        let prefix = null;
        if (config.value) {
            prefix = config.value;
        }
        else if (apiName) {
            prefix = `${apiName}_`;
        }
        if (!prefix) {
            throw new Error(`Transform 'prefix' has missing config: prefix`);
        }
        const ignoreList = [
            ...(config.ignore || []),
            'date',
            'hostname',
            'regex',
            'json-pointer',
            'relative-json-pointer',
            'uri-reference',
            'uri-template',
            ...Object.keys(resolvers),
        ];
        const includeTypes = config.includeTypes !== false;
        if (includeTypes) {
            this.transforms.push(new RenameTypes(typeName => (ignoreList.includes(typeName) ? typeName : `${prefix}${typeName}`)));
        }
        const includeRootOperations = config.includeRootOperations === true;
        if (includeRootOperations) {
            this.transforms.push(new RenameRootFields((typeName, fieldName) => ignoreList.includes(typeName) || ignoreList.includes(`${typeName}.${fieldName}`)
                ? fieldName
                : `${prefix}${fieldName}`));
        }
    }
    transformSchema(originalWrappingSchema, subschemaConfig, transformedSchema) {
        return applySchemaTransforms(originalWrappingSchema, subschemaConfig, transformedSchema, this.transforms);
    }
    transformRequest(originalRequest, delegationContext, transformationContext) {
        return applyRequestTransforms(originalRequest, delegationContext, transformationContext, this.transforms);
    }
    transformResult(originalResult, delegationContext, transformationContext) {
        return applyResultTransforms(originalResult, delegationContext, transformationContext, this.transforms);
    }
}

const rootOperations = new Set(['Query', 'Mutation', 'Subscription']);
class BarePrefix {
    constructor(options) {
        this.noWrap = true;
        const { apiName, config } = options;
        this.ignoreList = config.ignore || [];
        this.includeRootOperations = config.includeRootOperations === true;
        this.includeTypes = config.includeTypes !== false;
        this.prefix = null;
        if (config.value) {
            this.prefix = config.value;
        }
        else if (apiName) {
            this.prefix = `${apiName}_`;
        }
        if (!this.prefix) {
            throw new Error(`Transform 'prefix' has missing config: prefix`);
        }
    }
    transformSchema(schema) {
        return mapSchema(schema, {
            [MapperKind.TYPE]: (type) => {
                if (this.includeTypes && !isSpecifiedScalarType(type)) {
                    const currentName = type.name;
                    if (!this.ignoreList.includes(currentName)) {
                        return renameType(type, this.prefix + currentName);
                    }
                }
                return undefined;
            },
            [MapperKind.ROOT_OBJECT]() {
                return undefined;
            },
            ...(this.includeRootOperations && {
                [MapperKind.COMPOSITE_FIELD]: (fieldConfig, fieldName, typeName) => {
                    return !rootOperations.has(typeName) || // check we're in a root Type
                        this.ignoreList.includes(typeName) || // check if type is to be ignored
                        this.ignoreList.includes(`${typeName}.${fieldName}`) // check if field in type is to be ignored
                        ? undefined // do not perform any change
                        : [`${this.prefix}${fieldName}`, fieldConfig]; // apply prefix
                },
            }),
        });
    }
}

const PrefixTransform = (function PrefixTransform(options) {
    return options.config.mode === 'bare' ? new BarePrefix(options) : new WrapPrefix(options);
});

export default PrefixTransform;