Introduce standard.js compatibility flag

prettier · Jan 19, 2019 · 96ab928 · 96ab928
1 parent 633a12a
commit 96ab928
Show file tree

Hide file tree

Showing 20 changed files with 2,493 additions and 1 deletion.
diff --git a/docs/options.md b/docs/options.md
@@ -77,6 +77,14 @@ Use single quotes instead of double quotes in JSX.
 | ------- | -------------------- | ------------------------ |
 | `false` | `--jsx-single-quote` | `jsxSingleQuote: <bool>` |
 
+## Standard.js compatibility
+
+Configure prettier to be compatible with Standard.js
+
+| Default | CLI Override | API Override       |
+| ------- | ------------ | ------------------ |
+| `false` | `--standard` | `standard: <bool>` |
+
 ## Trailing Commas
 
 Print trailing commas wherever possible when multi-line. (A single-line array, for example, never gets trailing commas.)

diff --git a/src/language-js/options.js b/src/language-js/options.js
@@ -72,5 +72,12 @@ module.exports = {
       { value: true, deprecated: "0.19.0", redirect: "es5" },
       { value: false, deprecated: "0.19.0", redirect: "none" }
     ]
+  },
+  standard: {
+    since: "1.16.0",
+    category: CATEGORY_JAVASCRIPT,
+    type: "boolean",
+    default: false,
+    description: "Use standard rules for formatting."
   }
 };
diff --git a/src/language-js/printer-estree.js b/src/language-js/printer-estree.js
@@ -916,6 +916,9 @@ function printPathNoParens(path, options, print, args) {
       parts.push("yield");
 
       if (n.delegate) {
+        if (options.standard) {
+          parts.push(" ");
+        }
         parts.push("*");
       }
       if (n.argument) {
@@ -3723,6 +3726,9 @@ function printMethod(path, options, print) {
   if (!kind || kind === "init" || kind === "method" || kind === "constructor") {
     if (node.value.generator) {
       parts.push("*");
+      if (options.standard) {
+        parts.push(" ");
+      }
     }
   } else {
     assert.ok(kind === "get" || kind === "set");
@@ -3744,6 +3750,7 @@ function printMethod(path, options, print) {
           printFunctionTypeParameters(valuePath, options, print),
           group(
             concat([
+              options.standard ? " " : "",
               printFunctionParams(valuePath, print, options),
               printReturnType(valuePath, print, options)
             ])
@@ -4224,6 +4231,9 @@ function printFunctionDeclaration(path, print, options) {
   parts.push("function");
 
   if (n.generator) {
+    if (options.standard) {
+      parts.push(" ");
+    }
     parts.push("*");
   }
   if (n.id) {
@@ -4234,6 +4244,7 @@ function printFunctionDeclaration(path, print, options) {
     printFunctionTypeParameters(path, options, print),
     group(
       concat([
+        options.standard ? " " : "",
         printFunctionParams(path, print, options),
         printReturnType(path, print, options)
       ])
@@ -4254,6 +4265,9 @@ function printObjectMethod(path, options, print) {
   }
   if (objMethod.generator) {
     parts.push("*");
+    if (options.standard) {
+      parts.push(" ");
+    }
   }
   if (
     objMethod.method ||
@@ -4269,6 +4283,9 @@ function printObjectMethod(path, options, print) {
     parts.push("[", key, "]");
   } else {
     parts.push(key);
+    if (options.standard) {
+      parts.push(" ");
+    }
   }
 
   parts.push(

diff --git a/src/main/ast-to-doc.js b/src/main/ast-to-doc.js
@@ -34,6 +34,12 @@ const docUtils = doc.utils;
  * the path to the current node through the Abstract Syntax Tree.
  */
 function printAstToDoc(ast, options, alignmentSize = 0) {
+  if (options.standard) {
+    options.semi = false;
+    options.singleQuote = true;
+    options.jsxSingleQuote = true;
+  }
+
   const printer = options.printer;
 
   if (printer.preprocess) {