Avoid unnecessary ASI in output

[guybedford]

Feature Use Case

One of the great features of Rollup is the way it uses magic string to retain the original source code formatting.

It seems there is some automatic semicolon insertion though that is affecting this process.

For example, notice how Preact built with Rollup inserts semicolons in the code even where it is untouched by Rollup optimization (the first semicolon is after the removeChild(n) expression):

http://rollupjs.org/repl/?version=2.8.2&shareable=%7B%22modules%22%3A%5B%7B%22name%22%3A%22main.js%22%2C%22code%22%3A%22var%20n%2Cl%2Cu%2Ci%2Ct%2Cr%2Co%2Cf%2Ce%3D%7B%7D%2Cc%3D%5B%5D%2Cs%3D%2Facit%7Cex(%3F%3As%7Cg%7Cn%7Cp%7C%24)%7Crph%7Cgrid%7Cows%7Cmnc%7Cntw%7Cine%5Bch%5D%7Czoo%7C%5Eord%2Fi%3Bfunction%20a(n%2Cl)%7Bfor(var%20u%20in%20l)n%5Bu%5D%3Dl%5Bu%5D%3Breturn%20n%7Dfunction%20v(n)%7Bvar%20l%3Dn.parentNode%3Bl%26%26l.removeChild(n)%7Dfunction%20h(n%2Cl%2Cu)%7Bvar%20i%2Ct%3Darguments%2Cr%3D%7B%7D%3Bfor(i%20in%20l)%5C%22key%5C%22!%3D%3Di%26%26%5C%22ref%5C%22!%3D%3Di%26%26(r%5Bi%5D%3Dl%5Bi%5D)%3Bif(arguments.length%3E3)for(u%3D%5Bu%5D%2Ci%3D3%3Bi%3Carguments.length%3Bi%2B%2B)u.push(t%5Bi%5D)%3Bif(null!%3Du%26%26(r.children%3Du)%2C%5C%22function%5C%22%3D%3Dtypeof%20n%26%26null!%3Dn.defaultProps)for(i%20in%20n.defaultProps)void%200%3D%3D%3Dr%5Bi%5D%26%26(r%5Bi%5D%3Dn.defaultProps%5Bi%5D)%3Breturn%20p(n%2Cr%2Cl%26%26l.key%2Cl%26%26l.ref%2Cnull)%7Dfunction%20p(l%2Cu%2Ci%2Ct%2Cr)%7Bvar%20o%3D%7Btype%3Al%2Cprops%3Au%2Ckey%3Ai%2Cref%3At%2C__k%3Anull%2C__%3Anull%2C__b%3A0%2C__e%3Anull%2C__d%3Avoid%200%2C__c%3Anull%2Cconstructor%3Avoid%200%2C__v%3Ar%7D%3Breturn%20null%3D%3Dr%26%26(o.__v%3Do)%2Cn.vnode%26%26n.vnode(o)%2Co%7Dfunction%20y()%7Breturn%7B%7D%7Dfunction%20d(n)%7Breturn%20n.children%7Dfunction%20m(n%2Cl)%7Bthis.props%3Dn%2Cthis.context%3Dl%7Dfunction%20w(n%2Cl)%7Bif(null%3D%3Dl)return%20n.__%3Fw(n.__%2Cn.__.__k.indexOf(n)%2B1)%3Anull%3Bfor(var%20u%3Bl%3Cn.__k.length%3Bl%2B%2B)if(null!%3D(u%3Dn.__k%5Bl%5D)%26%26null!%3Du.__e)return%20u.__e%3Breturn%5C%22function%5C%22%3D%3Dtypeof%20n.type%3Fw(n)%3Anull%7Dfunction%20k(n)%7Bvar%20l%2Cu%3Bif(null!%3D(n%3Dn.__)%26%26null!%3Dn.__c)%7Bfor(n.__e%3Dn.__c.base%3Dnull%2Cl%3D0%3Bl%3Cn.__k.length%3Bl%2B%2B)if(null!%3D(u%3Dn.__k%5Bl%5D)%26%26null!%3Du.__e)%7Bn.__e%3Dn.__c.base%3Du.__e%3Bbreak%7Dreturn%20k(n)%7D%7Dfunction%20g(l)%7B(!l.__d%26%26(l.__d%3D!0)%26%26u.push(l)%26%26!i%2B%2B%7C%7Cr!%3D%3Dn.debounceRendering)%26%26((r%3Dn.debounceRendering)%7C%7Ct)(_)%7Dfunction%20_()%7Bfor(var%20n%3Bi%3Du.length%3B)n%3Du.sort(function(n%2Cl)%7Breturn%20n.__v.__b-l.__v.__b%7D)%2Cu%3D%5B%5D%2Cn.some(function(n)%7Bvar%20l%2Cu%2Ci%2Ct%2Cr%2Co%2Cf%3Bn.__d%26%26(o%3D(r%3D(l%3Dn).__v).__e%2C(f%3Dl.__P)%26%26(u%3D%5B%5D%2C(i%3Da(%7B%7D%2Cr)).__v%3Di%2Ct%3DA(f%2Cr%2Ci%2Cl.__n%2Cvoid%200!%3D%3Df.ownerSVGElement%2Cnull%2Cu%2Cnull%3D%3Do%3Fw(r)%3Ao)%2CT(u%2Cr)%2Ct!%3Do%26%26k(r)))%7D)%7Dfunction%20b(n%2Cl%2Cu%2Ci%2Ct%2Cr%2Co%2Cf%2Cs)%7Bvar%20a%2Ch%2Cp%2Cy%2Cd%2Cm%2Ck%2Cg%3Du%26%26u.__k%7C%7Cc%2C_%3Dg.length%3Bif(f%3D%3De%26%26(f%3Dnull!%3Dr%3Fr%5B0%5D%3A_%3Fw(u%2C0)%3Anull)%2Ca%3D0%2Cl.__k%3Dx(l.__k%2Cfunction(u)%7Bif(null!%3Du)%7Bif(u.__%3Dl%2Cu.__b%3Dl.__b%2B1%2Cnull%3D%3D%3D(p%3Dg%5Ba%5D)%7C%7Cp%26%26u.key%3D%3Dp.key%26%26u.type%3D%3D%3Dp.type)g%5Ba%5D%3Dvoid%200%3Belse%20for(h%3D0%3Bh%3C_%3Bh%2B%2B)%7Bif((p%3Dg%5Bh%5D)%26%26u.key%3D%3Dp.key%26%26u.type%3D%3D%3Dp.type)%7Bg%5Bh%5D%3Dvoid%200%3Bbreak%7Dp%3Dnull%7Dif(y%3DA(n%2Cu%2Cp%3Dp%7C%7Ce%2Ci%2Ct%2Cr%2Co%2Cf%2Cs)%2C(h%3Du.ref)%26%26p.ref!%3Dh%26%26(k%7C%7C(k%3D%5B%5D)%2Cp.ref%26%26k.push(p.ref%2Cnull%2Cu)%2Ck.push(h%2Cu.__c%7C%7Cy%2Cu))%2Cnull!%3Dy)%7Bvar%20c%3Bif(null%3D%3Dm%26%26(m%3Dy)%2Cvoid%200!%3D%3Du.__d)c%3Du.__d%2Cu.__d%3Dvoid%200%3Belse%20if(r%3D%3Dp%7C%7Cy!%3Df%7C%7Cnull%3D%3Dy.parentNode)%7Bn%3Aif(null%3D%3Df%7C%7Cf.parentNode!%3D%3Dn)n.appendChild(y)%2Cc%3Dnull%3Belse%7Bfor(d%3Df%2Ch%3D0%3B(d%3Dd.nextSibling)%26%26h%3C_%3Bh%2B%3D2)if(d%3D%3Dy)break%20n%3Bn.insertBefore(y%2Cf)%2Cc%3Df%7D%5C%22option%5C%22%3D%3Dl.type%26%26(n.value%3D%5C%22%5C%22)%7Df%3Dvoid%200!%3D%3Dc%3Fc%3Ay.nextSibling%2C%5C%22function%5C%22%3D%3Dtypeof%20l.type%26%26(l.__d%3Df)%7Delse%20f%26%26p.__e%3D%3Df%26%26f.parentNode!%3Dn%26%26(f%3Dw(p))%7Dreturn%20a%2B%2B%2Cu%7D)%2Cl.__e%3Dm%2Cnull!%3Dr%26%26%5C%22function%5C%22!%3Dtypeof%20l.type)for(a%3Dr.length%3Ba--%3B)null!%3Dr%5Ba%5D%26%26v(r%5Ba%5D)%3Bfor(a%3D_%3Ba--%3B)null!%3Dg%5Ba%5D%26%26D(g%5Ba%5D%2Cg%5Ba%5D)%3Bif(k)for(a%3D0%3Ba%3Ck.length%3Ba%2B%2B)j(k%5Ba%5D%2Ck%5B%2B%2Ba%5D%2Ck%5B%2B%2Ba%5D)%7Dfunction%20x(n%2Cl%2Cu)%7Bif(null%3D%3Du%26%26(u%3D%5B%5D)%2Cnull%3D%3Dn%7C%7C%5C%22boolean%5C%22%3D%3Dtypeof%20n)l%26%26u.push(l(null))%3Belse%20if(Array.isArray(n))for(var%20i%3D0%3Bi%3Cn.length%3Bi%2B%2B)x(n%5Bi%5D%2Cl%2Cu)%3Belse%20u.push(l%3Fl(%5C%22string%5C%22%3D%3Dtypeof%20n%7C%7C%5C%22number%5C%22%3D%3Dtypeof%20n%3Fp(null%2Cn%2Cnull%2Cnull%2Cn)%3Anull!%3Dn.__e%7C%7Cnull!%3Dn.__c%3Fp(n.type%2Cn.props%2Cn.key%2Cnull%2Cn.__v)%3An)%3An)%3Breturn%20u%7Dfunction%20P(n%2Cl%2Cu%2Ci%2Ct)%7Bvar%20r%3Bfor(r%20in%20u)%5C%22children%5C%22%3D%3D%3Dr%7C%7C%5C%22key%5C%22%3D%3D%3Dr%7C%7Cr%20in%20l%7C%7CN(n%2Cr%2Cnull%2Cu%5Br%5D%2Ci)%3Bfor(r%20in%20l)t%26%26%5C%22function%5C%22!%3Dtypeof%20l%5Br%5D%7C%7C%5C%22children%5C%22%3D%3D%3Dr%7C%7C%5C%22key%5C%22%3D%3D%3Dr%7C%7C%5C%22value%5C%22%3D%3D%3Dr%7C%7C%5C%22checked%5C%22%3D%3D%3Dr%7C%7Cu%5Br%5D%3D%3D%3Dl%5Br%5D%7C%7CN(n%2Cr%2Cl%5Br%5D%2Cu%5Br%5D%2Ci)%7Dfunction%20C(n%2Cl%2Cu)%7B%5C%22-%5C%22%3D%3D%3Dl%5B0%5D%3Fn.setProperty(l%2Cu)%3An%5Bl%5D%3D%5C%22number%5C%22%3D%3Dtypeof%20u%26%26!1%3D%3D%3Ds.test(l)%3Fu%2B%5C%22px%5C%22%3Anull%3D%3Du%3F%5C%22%5C%22%3Au%7Dfunction%20N(n%2Cl%2Cu%2Ci%2Ct)%7Bvar%20r%2Co%2Cf%2Ce%2Cc%3Bif(t%3F%5C%22className%5C%22%3D%3D%3Dl%26%26(l%3D%5C%22class%5C%22)%3A%5C%22class%5C%22%3D%3D%3Dl%26%26(l%3D%5C%22className%5C%22)%2C%5C%22style%5C%22%3D%3D%3Dl)if(r%3Dn.style%2C%5C%22string%5C%22%3D%3Dtypeof%20u)r.cssText%3Du%3Belse%7Bif(%5C%22string%5C%22%3D%3Dtypeof%20i%26%26(r.cssText%3D%5C%22%5C%22%2Ci%3Dnull)%2Ci)for(e%20in%20i)u%26%26e%20in%20u%7C%7CC(r%2Ce%2C%5C%22%5C%22)%3Bif(u)for(c%20in%20u)i%26%26u%5Bc%5D%3D%3D%3Di%5Bc%5D%7C%7CC(r%2Cc%2Cu%5Bc%5D)%7Delse%5C%22o%5C%22%3D%3D%3Dl%5B0%5D%26%26%5C%22n%5C%22%3D%3D%3Dl%5B1%5D%3F(o%3Dl!%3D%3D(l%3Dl.replace(%2FCapture%24%2F%2C%5C%22%5C%22))%2Cf%3Dl.toLowerCase()%2Cl%3D(f%20in%20n%3Ff%3Al).slice(2)%2Cu%3F(i%7C%7Cn.addEventListener(l%2Cz%2Co)%2C(n.l%7C%7C(n.l%3D%7B%7D))%5Bl%5D%3Du)%3An.removeEventListener(l%2Cz%2Co))%3A%5C%22list%5C%22!%3D%3Dl%26%26%5C%22tagName%5C%22!%3D%3Dl%26%26%5C%22form%5C%22!%3D%3Dl%26%26%5C%22type%5C%22!%3D%3Dl%26%26%5C%22size%5C%22!%3D%3Dl%26%26!t%26%26l%20in%20n%3Fn%5Bl%5D%3Dnull%3D%3Du%3F%5C%22%5C%22%3Au%3A%5C%22function%5C%22!%3Dtypeof%20u%26%26%5C%22dangerouslySetInnerHTML%5C%22!%3D%3Dl%26%26(l!%3D%3D(l%3Dl.replace(%2F%5Exlink%3A%3F%2F%2C%5C%22%5C%22))%3Fnull%3D%3Du%7C%7C!1%3D%3D%3Du%3Fn.removeAttributeNS(%5C%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%5C%22%2Cl.toLowerCase())%3An.setAttributeNS(%5C%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%5C%22%2Cl.toLowerCase()%2Cu)%3Anull%3D%3Du%7C%7C!1%3D%3D%3Du%26%26!%2F%5Ear%2F.test(l)%3Fn.removeAttribute(l)%3An.setAttribute(l%2Cu))%7Dfunction%20z(l)%7Bthis.l%5Bl.type%5D(n.event%3Fn.event(l)%3Al)%7Dfunction%20A(l%2Cu%2Ci%2Ct%2Cr%2Co%2Cf%2Ce%2Cc)%7Bvar%20s%2Cv%2Ch%2Cp%2Cy%2Cw%2Ck%2Cg%2C_%2Cx%2CP%3Du.type%3Bif(void%200!%3D%3Du.constructor)return%20null%3B(s%3Dn.__b)%26%26s(u)%3Btry%7Bn%3Aif(%5C%22function%5C%22%3D%3Dtypeof%20P)%7Bif(g%3Du.props%2C_%3D(s%3DP.contextType)%26%26t%5Bs.__c%5D%2Cx%3Ds%3F_%3F_.props.value%3As.__%3At%2Ci.__c%3Fk%3D(v%3Du.__c%3Di.__c).__%3Dv.__E%3A(%5C%22prototype%5C%22in%20P%26%26P.prototype.render%3Fu.__c%3Dv%3Dnew%20P(g%2Cx)%3A(u.__c%3Dv%3Dnew%20m(g%2Cx)%2Cv.constructor%3DP%2Cv.render%3DE)%2C_%26%26_.sub(v)%2Cv.props%3Dg%2Cv.state%7C%7C(v.state%3D%7B%7D)%2Cv.context%3Dx%2Cv.__n%3Dt%2Ch%3Dv.__d%3D!0%2Cv.__h%3D%5B%5D)%2Cnull%3D%3Dv.__s%26%26(v.__s%3Dv.state)%2Cnull!%3DP.getDerivedStateFromProps%26%26(v.__s%3D%3Dv.state%26%26(v.__s%3Da(%7B%7D%2Cv.__s))%2Ca(v.__s%2CP.getDerivedStateFromProps(g%2Cv.__s)))%2Cp%3Dv.props%2Cy%3Dv.state%2Ch)null%3D%3DP.getDerivedStateFromProps%26%26null!%3Dv.componentWillMount%26%26v.componentWillMount()%2Cnull!%3Dv.componentDidMount%26%26v.__h.push(v.componentDidMount)%3Belse%7Bif(null%3D%3DP.getDerivedStateFromProps%26%26g!%3D%3Dp%26%26null!%3Dv.componentWillReceiveProps%26%26v.componentWillReceiveProps(g%2Cx)%2C!v.__e%26%26null!%3Dv.shouldComponentUpdate%26%26!1%3D%3D%3Dv.shouldComponentUpdate(g%2Cv.__s%2Cx)%7C%7Cu.__v%3D%3D%3Di.__v%26%26!v.__)%7Bfor(v.props%3Dg%2Cv.state%3Dv.__s%2Cu.__v!%3D%3Di.__v%26%26(v.__d%3D!1)%2Cv.__v%3Du%2Cu.__e%3Di.__e%2Cu.__k%3Di.__k%2Cv.__h.length%26%26f.push(v)%2Cs%3D0%3Bs%3Cu.__k.length%3Bs%2B%2B)u.__k%5Bs%5D%26%26(u.__k%5Bs%5D.__%3Du)%3Bbreak%20n%7Dnull!%3Dv.componentWillUpdate%26%26v.componentWillUpdate(g%2Cv.__s%2Cx)%2Cnull!%3Dv.componentDidUpdate%26%26v.__h.push(function()%7Bv.componentDidUpdate(p%2Cy%2Cw)%7D)%7Dv.context%3Dx%2Cv.props%3Dg%2Cv.state%3Dv.__s%2C(s%3Dn.__r)%26%26s(u)%2Cv.__d%3D!1%2Cv.__v%3Du%2Cv.__P%3Dl%2Cs%3Dv.render(v.props%2Cv.state%2Cv.context)%2Cu.__k%3Dnull!%3Ds%26%26s.type%3D%3Dd%26%26null%3D%3Ds.key%3Fs.props.children%3AArray.isArray(s)%3Fs%3A%5Bs%5D%2Cnull!%3Dv.getChildContext%26%26(t%3Da(a(%7B%7D%2Ct)%2Cv.getChildContext()))%2Ch%7C%7Cnull%3D%3Dv.getSnapshotBeforeUpdate%7C%7C(w%3Dv.getSnapshotBeforeUpdate(p%2Cy))%2Cb(l%2Cu%2Ci%2Ct%2Cr%2Co%2Cf%2Ce%2Cc)%2Cv.base%3Du.__e%2Cv.__h.length%26%26f.push(v)%2Ck%26%26(v.__E%3Dv.__%3Dnull)%2Cv.__e%3D!1%7Delse%20null%3D%3Do%26%26u.__v%3D%3D%3Di.__v%3F(u.__k%3Di.__k%2Cu.__e%3Di.__e)%3Au.__e%3D%24(i.__e%2Cu%2Ci%2Ct%2Cr%2Co%2Cf%2Cc)%3B(s%3Dn.diffed)%26%26s(u)%7Dcatch(l)%7Bu.__v%3Dnull%2Cn.__e(l%2Cu%2Ci)%7Dreturn%20u.__e%7Dfunction%20T(l%2Cu)%7Bn.__c%26%26n.__c(u%2Cl)%2Cl.some(function(u)%7Btry%7Bl%3Du.__h%2Cu.__h%3D%5B%5D%2Cl.some(function(n)%7Bn.call(u)%7D)%7Dcatch(l)%7Bn.__e(l%2Cu.__v)%7D%7D)%7Dfunction%20%24(n%2Cl%2Cu%2Ci%2Ct%2Cr%2Co%2Cf)%7Bvar%20s%2Ca%2Cv%2Ch%2Cp%2Cy%3Du.props%2Cd%3Dl.props%3Bif(t%3D%5C%22svg%5C%22%3D%3D%3Dl.type%7C%7Ct%2Cnull!%3Dr)for(s%3D0%3Bs%3Cr.length%3Bs%2B%2B)if(null!%3D(a%3Dr%5Bs%5D)%26%26((null%3D%3D%3Dl.type%3F3%3D%3D%3Da.nodeType%3Aa.localName%3D%3D%3Dl.type)%7C%7Cn%3D%3Da))%7Bn%3Da%2Cr%5Bs%5D%3Dnull%3Bbreak%7Dif(null%3D%3Dn)%7Bif(null%3D%3D%3Dl.type)return%20document.createTextNode(d)%3Bn%3Dt%3Fdocument.createElementNS(%5C%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%5C%22%2Cl.type)%3Adocument.createElement(l.type%2Cd.is%26%26%7Bis%3Ad.is%7D)%2Cr%3Dnull%2Cf%3D!1%7Dif(null%3D%3D%3Dl.type)y!%3D%3Dd%26%26n.data!%3Dd%26%26(n.data%3Dd)%3Belse%7Bif(null!%3Dr%26%26(r%3Dc.slice.call(n.childNodes))%2Cv%3D(y%3Du.props%7C%7Ce).dangerouslySetInnerHTML%2Ch%3Dd.dangerouslySetInnerHTML%2C!f)%7Bif(y%3D%3D%3De)for(y%3D%7B%7D%2Cp%3D0%3Bp%3Cn.attributes.length%3Bp%2B%2B)y%5Bn.attributes%5Bp%5D.name%5D%3Dn.attributes%5Bp%5D.value%3B(h%7C%7Cv)%26%26(h%26%26v%26%26h.__html%3D%3Dv.__html%7C%7C(n.innerHTML%3Dh%26%26h.__html%7C%7C%5C%22%5C%22))%7DP(n%2Cd%2Cy%2Ct%2Cf)%2Ch%3Fl.__k%3D%5B%5D%3A(l.__k%3Dl.props.children%2Cb(n%2Cl%2Cu%2Ci%2C%5C%22foreignObject%5C%22!%3D%3Dl.type%26%26t%2Cr%2Co%2Ce%2Cf))%2Cf%7C%7C(%5C%22value%5C%22in%20d%26%26void%200!%3D%3D(s%3Dd.value)%26%26s!%3D%3Dn.value%26%26N(n%2C%5C%22value%5C%22%2Cs%2Cy.value%2C!1)%2C%5C%22checked%5C%22in%20d%26%26void%200!%3D%3D(s%3Dd.checked)%26%26s!%3D%3Dn.checked%26%26N(n%2C%5C%22checked%5C%22%2Cs%2Cy.checked%2C!1))%7Dreturn%20n%7Dfunction%20j(l%2Cu%2Ci)%7Btry%7B%5C%22function%5C%22%3D%3Dtypeof%20l%3Fl(u)%3Al.current%3Du%7Dcatch(l)%7Bn.__e(l%2Ci)%7D%7Dfunction%20D(l%2Cu%2Ci)%7Bvar%20t%2Cr%2Co%3Bif(n.unmount%26%26n.unmount(l)%2C(t%3Dl.ref)%26%26(t.current%26%26t.current!%3D%3Dl.__e%7C%7Cj(t%2Cnull%2Cu))%2Ci%7C%7C%5C%22function%5C%22%3D%3Dtypeof%20l.type%7C%7C(i%3Dnull!%3D(r%3Dl.__e))%2Cl.__e%3Dl.__d%3Dvoid%200%2Cnull!%3D(t%3Dl.__c))%7Bif(t.componentWillUnmount)try%7Bt.componentWillUnmount()%7Dcatch(l)%7Bn.__e(l%2Cu)%7Dt.base%3Dt.__P%3Dnull%7Dif(t%3Dl.__k)for(o%3D0%3Bo%3Ct.length%3Bo%2B%2B)t%5Bo%5D%26%26D(t%5Bo%5D%2Cu%2Ci)%3Bnull!%3Dr%26%26v(r)%7Dfunction%20E(n%2Cl%2Cu)%7Breturn%20this.constructor(n%2Cu)%7Dfunction%20H(l%2Cu%2Ci)%7Bvar%20t%2Cr%2Cf%3Bn.__%26%26n.__(l%2Cu)%2Cr%3D(t%3Di%3D%3D%3Do)%3Fnull%3Ai%26%26i.__k%7C%7Cu.__k%2Cl%3Dh(d%2Cnull%2C%5Bl%5D)%2Cf%3D%5B%5D%2CA(u%2C(t%3Fu%3Ai%7C%7Cu).__k%3Dl%2Cr%7C%7Ce%2Ce%2Cvoid%200!%3D%3Du.ownerSVGElement%2Ci%26%26!t%3F%5Bi%5D%3Ar%3Fnull%3Ac.slice.call(u.childNodes)%2Cf%2Ci%7C%7Ce%2Ct)%2CT(f%2Cl)%7Dfunction%20I(n%2Cl)%7BH(n%2Cl%2Co)%7Dfunction%20L(n%2Cl)%7Bvar%20u%2Ci%3Bfor(i%20in%20l%3Da(a(%7B%7D%2Cn.props)%2Cl)%2Carguments.length%3E2%26%26(l.children%3Dc.slice.call(arguments%2C2))%2Cu%3D%7B%7D%2Cl)%5C%22key%5C%22!%3D%3Di%26%26%5C%22ref%5C%22!%3D%3Di%26%26(u%5Bi%5D%3Dl%5Bi%5D)%3Breturn%20p(n.type%2Cu%2Cl.key%7C%7Cn.key%2Cl.ref%7C%7Cn.ref%2Cnull)%7Dfunction%20M(n)%7Bvar%20l%3D%7B%7D%2Cu%3D%7B__c%3A%5C%22__cC%5C%22%2Bf%2B%2B%2C__%3An%2CConsumer%3Afunction(n%2Cl)%7Breturn%20n.children(l)%7D%2CProvider%3Afunction(n)%7Bvar%20i%2Ct%3Dthis%3Breturn%20this.getChildContext%7C%7C(i%3D%5B%5D%2Cthis.getChildContext%3Dfunction()%7Breturn%20l%5Bu.__c%5D%3Dt%2Cl%7D%2Cthis.shouldComponentUpdate%3Dfunction(n)%7Bt.props.value!%3D%3Dn.value%26%26i.some(function(l)%7Bl.context%3Dn.value%2Cg(l)%7D)%7D%2Cthis.sub%3Dfunction(n)%7Bi.push(n)%3Bvar%20l%3Dn.componentWillUnmount%3Bn.componentWillUnmount%3Dfunction()%7Bi.splice(i.indexOf(n)%2C1)%2Cl%26%26l.call(n)%7D%7D)%2Cn.children%7D%7D%3Breturn%20u.Consumer.contextType%3Du%2Cu.Provider.__%3Du%2Cu%7Dn%3D%7B__e%3Afunction(n%2Cl)%7Bfor(var%20u%2Ci%3Bl%3Dl.__%3B)if((u%3Dl.__c)%26%26!u.__)try%7Bif(u.constructor%26%26null!%3Du.constructor.getDerivedStateFromError%26%26(i%3D!0%2Cu.setState(u.constructor.getDerivedStateFromError(n)))%2Cnull!%3Du.componentDidCatch%26%26(i%3D!0%2Cu.componentDidCatch(n))%2Ci)return%20g(u.__E%3Du)%7Dcatch(l)%7Bn%3Dl%7Dthrow%20n%7D%7D%2Cl%3Dfunction(n)%7Breturn%20null!%3Dn%26%26void%200%3D%3D%3Dn.constructor%7D%2Cm.prototype.setState%3Dfunction(n%2Cl)%7Bvar%20u%3Bu%3Dthis.__s!%3D%3Dthis.state%3Fthis.__s%3Athis.__s%3Da(%7B%7D%2Cthis.state)%2C%5C%22function%5C%22%3D%3Dtypeof%20n%26%26(n%3Dn(u%2Cthis.props))%2Cn%26%26a(u%2Cn)%2Cnull!%3Dn%26%26this.__v%26%26(l%26%26this.__h.push(l)%2Cg(this))%7D%2Cm.prototype.forceUpdate%3Dfunction(n)%7Bthis.__v%26%26(this.__e%3D!0%2Cn%26%26this.__h.push(n)%2Cg(this))%7D%2Cm.prototype.render%3Dd%2Cu%3D%5B%5D%2Ci%3D0%2Ct%3D%5C%22function%5C%22%3D%3Dtypeof%20Promise%3FPromise.prototype.then.bind(Promise.resolve())%3AsetTimeout%2Co%3De%2Cf%3D0%3Bexport%7BH%20as%20render%2CI%20as%20hydrate%2Ch%20as%20createElement%2Ch%2Cd%20as%20Fragment%2Cy%20as%20createRef%2Cl%20as%20isValidElement%2Cm%20as%20Component%2CL%20as%20cloneElement%2CM%20as%20createContext%2Cx%20as%20toChildArray%2CD%20as%20_unmount%2Cn%20as%20options%7D%3B%22%2C%22isEntry%22%3Atrue%7D%5D%2C%22options%22%3A%7B%22format%22%3A%22es%22%2C%22name%22%3A%22myBundle%22%2C%22amd%22%3A%7B%22id%22%3A%22%22%7D%2C%22globals%22%3A%7B%7D%7D%2C%22example%22%3Anull%7D

Feature Proposal

It should be possible to disable this ASI when no source transformations have taken place to that code.

A simpler starting heuristic could also be to just disable ASI entirely when treeshaking: false is used.

[guybedford]

Unfortunately it seems the Preact example is breaking the repl request length :)

It can be seen by copying this source though - https://unpkg.com/preact@10.4.1/dist/preact.module.js.

[lukastaegert]

This ASI makes things a lot easier as there are many edge cases where "untouched code" borders on other modules or modified code that we do no need to handle explicitly here. Avoiding this will also not provide any structural code improvements but rather just some syntactic optimization. If people are interested in this minimal gain, I would rather expect them to use a minifier to handle this. For Rollup, this will just introduce complexity.