Error when compiling non ES5 style function syntax

[acode-x]

protobuf.js version: 7.1.2

Hi,

I am using duktape Javascript engine (ES5/5.1 compliant + few features ES6/7) along with protobuf.js.
I get the following error when compiling protobuf.js: SyntaxError: invalid object literal (line x)

This is due to the fact that duktape doesn’t understand the function syntax as below:

protobuf.js/src/util/minimal.js

Line 291 in d026849

get() { return name; },

protobuf.js/src/util/minimal.js

Line 301 in d026849

value() { return this.name + ": " + this.message; },

Would be great if we could follow a common syntax like in other protobuf.js files. Example:

protobuf.js/src/reader.js

Line 390 in d026849

int64: function read_int64() {