disallowFullImportRxjsOperatorsRule.ts

import {ImportDeclaration, SourceFile} from 'typescript';
import {RuleFailure, Rules, RuleWalker} from 'tslint';

const disallowedImports: string[] = [
    // lettable import
    '\'rxjs/operators\'',
    '"rxjs/operators"',
    // not-lettable import
    'rxjs/add/operator',
];

export class Rule extends Rules.AbstractRule {
    public apply (sourceFile: SourceFile): RuleFailure[] {
        return this.applyWithWalker(new Walker(sourceFile, this.getOptions()));
    }
}

class Walker extends RuleWalker {
    public visitImportDeclaration (importDeclaration: ImportDeclaration): void {
        const importDeclarationText: string = importDeclaration.getText();

        if (this.hasDisallowedImport(importDeclarationText)) {
            this.addFailureAt(
                importDeclaration.getStart(),
                importDeclaration.getWidth(),
                'RxJS operators should be imported from their own scope. ',
            );
        }
    }

    private hasDisallowedImport (importDeclarationText: string): boolean {
        return disallowedImports.some((i: string): boolean => importDeclarationText.indexOf(i) !== -1);
    }
}