fix: Silence postcss warning message.

Author: chriseppstein

packages/@css-blocks/core/src/BlockParser/BlockFactory.ts

@@ -145,25 +145,25 @@ export class BlockFactory {
         })
 
         // Run through PostCSS.
-        .then(async (preprocessResult): Promise<[ProcessedFile, postcss.Result]> => {
+        .then(async (preprocessResult): Promise<[ProcessedFile, postcss.Root]> => {
           debug(`Generating PostCSS AST for "${filename}"`);
           let sourceMap = sourceMapFromProcessedFile(preprocessResult);
           let content = preprocessResult.content;
           if (sourceMap) {
             content = annotateCssContentWithSourceMap(content, sourceMap);
           }
-          let result = await this.postcssImpl().process(content, { from: filename });
-          return [preprocessResult, result];
+          let root = await this.postcssImpl.parse(content, { from: filename });
+          return [preprocessResult, root];
         })
 
-        .then(([preprocessedResult, result]) => {
+        .then(([preprocessedResult, root]) => {
           debug(`Parsing Block object for "${filename}"`);
           // Skip parsing if we can.
           if (this.blocks[file.identifier]) { return this.blocks[file.identifier]; }
           let source: ParsedSource = {
             identifier: file.identifier,
             defaultName: file.defaultName,
-            parseResult: result,
+            parseResult: root,
             originalSource: file.contents,
             originalSyntax: file.syntax,
             dependencies: preprocessedResult.dependencies || [],

packages/@css-blocks/core/src/BlockParser/BlockParser.ts

@@ -3,7 +3,6 @@ import { postcss } from "opticss";
 
 import { Block } from "../BlockTree";
 import { Options, ResolvedConfiguration, resolveConfiguration } from "../configuration";
-import * as errors from "../errors";
 import { FileIdentifier } from "../importing";
 
 import { assertForeignGlobalAttribute } from "./features/assert-foreign-global-attribute";
@@ -27,7 +26,7 @@ export interface ParsedSource {
   defaultName: string;
   originalSource: string;
   originalSyntax: Syntax;
-  parseResult: postcss.Result;
+  parseResult: postcss.Root;
   dependencies: string[];
 }
 
@@ -45,10 +44,7 @@ export class BlockParser {
   }
 
   public parseSource(source: ParsedSource): Promise<Block> {
-    let root = source.parseResult.root;
-
-    // This should never happen but it makes the typechecker happy.
-    if (!root) { throw new errors.CssBlockError("No postcss root found."); }
+    let root = source.parseResult;
 
     return this.parse(root, source.identifier, source.defaultName).then(block => {
       source.dependencies.forEach(block.addDependency);