Switch to the 2.x version of the mime library.

package.json

@@ -63,7 +63,7 @@
     "exif-reader": "^1.0.3",
     "icc": "^1.0.0",
     "lodash": "^4.17.15",
-    "mime": "^1.6.0",
+    "mime": "^2.5.2",
     "require-or": "0.0.2"
   }
 }

src/Impro.js

@@ -1,11 +1,6 @@
 const _ = require('lodash');
-const mime = require('mime');
 const Pipeline = require('./Pipeline');
 
-mime.define({
-  'image/vnd.microsoft.icon': ['ico'],
-});
-
 module.exports = class Impro {
   constructor(options) {
     if (!options || typeof options === 'object') {

src/Pipeline.js

@@ -1,7 +1,8 @@
 const Stream = require('stream');
-const mime = require('mime');
 const Path = require('path');
 
+const mime = require('./mime');
+
 module.exports = class Pipeline extends Stream.Duplex {
   constructor(impro, options) {
     super();
@@ -164,7 +165,7 @@ module.exports = class Pipeline extends Stream.Duplex {
         ) {
           if (this.impro.isTypeByName[operation.name]) {
             this.targetType = operation.name;
-            this.targetContentType = mime.types[operation.name];
+            this.targetContentType = mime.getType(operation.name);
           }
 
           candidateEngineNames = filteredCandidateEngineNames;
@@ -179,7 +180,7 @@ module.exports = class Pipeline extends Stream.Duplex {
           // only then set the new type after the flush.
           if (this.impro.isTypeByName[operation.name]) {
             this.targetType = operation.name;
-            this.targetContentType = mime.types[operation.name];
+            this.targetContentType = mime.getType(operation.name);
           }
 
           lastSelectedEngineName = undefined;
@@ -363,9 +364,9 @@ module.exports = class Pipeline extends Stream.Duplex {
     } else {
       if (this.impro.isTypeByName[type]) {
         this.sourceType = this.targetType = type;
-        this.targetContentType = mime.types[type];
+        this.targetContentType = mime.getType(type);
       } else {
-        const extension = mime.extensions[type.replace(/\s*;.*$/, '')];
+        const extension = mime.getExtension(type);
         if (extension) {
           if (this.impro.isTypeByName[extension]) {
             this.sourceType = this.targetType = extension;

src/engines/metadata.js

@@ -2,11 +2,12 @@ const requireOr = require('require-or');
 const sharp = requireOr('sharp');
 const Stream = require('stream');
 const createAnimatedGifDetector = requireOr('animated-gif-detector');
-const mime = require('mime');
 const exifReader = require('exif-reader');
 const icc = require('icc');
 const _ = require('lodash');
 
+const mime = require('../mime');
+
 module.exports = {
   name: 'metadata',
   unavailable: !sharp,
@@ -69,7 +70,7 @@ module.exports = {
     const alreadyKnownMetadata = {
       format: pipeline.targetType,
       contentType:
-        pipeline.targetContentType || mime.types[pipeline.targetType],
+        pipeline.targetContentType || mime.getType(pipeline.targetType),
     };
     if (pipeline._streams.length === 0) {
       _.extend(alreadyKnownMetadata, pipeline.sourceMetadata);

src/mime.js

@@ -0,0 +1,4 @@
+const mime = require('mime');
+
+module.exports.getExtension = (ext) => mime.getExtension(ext) || undefined;
+module.exports.getType = (type) => mime.getType(type) || undefined;

test/impro.spec.js

@@ -377,6 +377,11 @@ describe('impro', () => {
   });
 
   describe('#metadata', () => {
+    it('should default the output content type to JSON', () =>
+      expect(impro.metadata().flush(), 'to satisfy', {
+        targetContentType: 'application/json; charset=utf-8',
+      }));
+
     it('should produce the metadata of an image as JSON', () =>
       expect(
         'turtle.jpg',