update substitution placeholder message in @babel/template (babel#7255)

Author: thescientist13

packages/babel-template/src/populate.js

@@ -15,7 +15,14 @@ export default function populatePlaceholders(
       if (
         !Object.prototype.hasOwnProperty.call(replacements, placeholder.name)
       ) {
-        throw new Error(`No substitution given for "${placeholder.name}"`);
+        const placeholderName = placeholder.name;
+
+        throw new Error(
+          `Error: No substitution given for "${placeholderName}". If this is not meant to be a
+            placeholder you may want to consider passing one of the following options to babel-template:
+            - { placeholderPattern: false, placeholderWhitelist: new Set(['${placeholderName}'])}
+            - { placeholderPattern: /^${placeholderName}$/ }`,
+        );
       }
     });
     Object.keys(replacements).forEach(key => {

packages/babel-template/test/index.js

@@ -133,7 +133,13 @@ describe("babel-template", function() {
           ID;
           ANOTHER_ID;
         `)({ ID: t.identifier("someIdent") });
-      }).to.throw(Error, 'No substitution given for "ANOTHER_ID"');
+      }).to.throw(
+        Error,
+        `Error: No substitution given for "ANOTHER_ID". If this is not meant to be a
+            placeholder you may want to consider passing one of the following options to babel-template:
+            - { placeholderPattern: false, placeholderWhitelist: new Set(['ANOTHER_ID'])}
+            - { placeholderPattern: /^ANOTHER_ID$/ }`,
+      );
     });
 
     it("should return the AST directly when using .ast", () => {